ThinkGeo UI Controls
ThinkGeo Open Source
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ThinkGeo UI Controls
ThinkGeo Open Source
Help and Support
Today’s sample shows the new feature available in this may release Map Suite 5 for creating GRID files. A GRID is a raster format that defines a geographic space as an array of equally sized squares (cells) arranged in rows and columns. Each cell stores a numeric value that represents an attribute (such as elevation, surface slope, soil pH etc.) for that unit of space. Each GRID cell is referenced by its x, y coordinate location. Typically a GRID file is created based on some sample points with known values. In today’s sample, we take the example of creating a GRID file based on a point based shapefile representing soil pH values of some sample locations in a field. Using the Inverse Weighted Distance algorithm for interpolation, we create the GRID with the pH value for the entire extent of the field. Look at the code and comments for more details on how GRID files get generated and displayed on the map. This sample is a Desktop application but GRID can be used in all the editions of Map Suite.
The purpose of this Wpf sample is to show how to edit the attribute of a feature of a shapefile. This sample is useful for anyone wanting to actualize the attribute part of its data by simply clicking on the desired feature on the map and updating its attribute in a textbox. You will find the editing part of the code in the KeyDown event of the textbox.
The purpose of this sample is to show how to update the geometry of a feature of a shapefile in one step. This sample is useful for anyone wanting to actualize the geometry part of its data. You can see how only a few lines of code are necessary for this process and that the spatial index gets automatically updated after calling the committing the change. Notice that this sample does not show all the fanciness for manipulating at user interaction the geometry to be updated. For this purpose, you can see all the samples related to TrackInteractiveOverlay and EditInteractiveOverlay.
In this Silverlight-based project, we are going to take a look at how to get geometry data from the server side using the WCF service with Map Suite Silverlight Edition, while keeping all map data on the server side. You can click any of the countries on the map to call a WCF service, which will require data from the server, and then a popup will appear with information about that country.
From a request in a Discussion Forum post, today we decided to have the Web version of a similar project Graphic “Logo Adornment Layer” for Desktop. Here we show how to use the class GraphicLogoAdornmentLayer inheriting AdornmentLayer for the Web edition.
Heat maps is a technique increasingly used in various fields such in biology and other fields. See http://en.wikipedia.org/wiki/Heat_map. They are also used for displaying areas of webs page most frequently scanned by users. http://csscreme.com/heat-maps/.
At ThinkGeo, we are taking this concept to GIS and applying it to geographic maps. Heat maps are a great way to give the users a visually compelling representation of the distribution and intensity of geographic phenomenon.
Today, we are posting two Desktop projects on that subject. The first one is using the swine flu data we used in an earlier project. You can see how powerful the visualization of that data is to show the spatial distribution flu swine cases. In the next project, you will see how to take into account column values to produce various degrees of intensity using some earthquake data. In those two projects, you will need references to MapSuiteCore.dll and DesktopEdition.dll.
After the project on displaying swine flu data using the heat map technique, here you learn how to apply parameters other than strictly spatial distribution to affect the coloring of the map.
In this example, the magnitude of each earthquake (from 0 to 12) is taken into account to influence the displaying of the heat map. The result is California appearing even more intense than if only the spatial distribution were taken into account.
As for the previous project, you will need references to MapSuiteCore.dll, DesktopEdition.dll. As a caveat on heat map in GIS, it is worth mentioning that while this is great tool for displaying data in a very appealing and communicative way, it cannot be used as an analysis tool for studying spatial behaviors. For spatial analysis, GRID is the appropriate tool. Although a heat map looks like a GRID, it is not one and it cannot substitute GRID for spatial analysis.
As an alternative to loading an Image with the image file from the file system, you can choose to pass your own stream. This project shows you how to use the event StreamLoading of GdiPlusRasterSource for this purpose. In this project, we show how to do this using a Tiff image but you can also use that event for ShapeFileFeatureSource as we show in a previous project “Shapefile Encryption”. Keep in mind that this technique only works with images besides MrSid, ECW and Jpeg2000. These types of images do not work because the providers do not support streams in their decoding SDKs.
Upon requests from Map Suite Web developers, we created this project. It is the web version of the Desktop project “KML Extension” where we learned how to display on the map files in the KML format.
KML is the file format for displaying geographic data in a Google Earth browser such as Google Earth. Now, you can also display such a file on a Map Suite control. Thanks to its flexible architecture to extent to new file formats, in today’s project we wrote the logic for supporting KML. Look at the class KmlfeatureSource inheriting from FeatureSource to see how the logic for reading FML files was implemented. As well, you can see the class KmlStyle inheriting from Style for the drawing logic. And feel free to modify and improve those classes with your own implementations.
After the projects on North Arrow and Compass, we created another project related to Adornment Layer to have a more stylish map and give more information to the user navigating the map.
In this project, we create a Graticule Adorment Layer that shows Meridians and Parallels displaying through the map. Meridians are lines of longitude and they have a North South orientation. Parallels are lines of latitude and they have an East West orientation.
Showing graticule for latitude and longitude is a standard way in cartography to give spatial references to the users.
You will find two zip files. One is for the Desktop Edition “LatLongGraticule” and it shows nicely the effect of the meridians and parallels as you pan and zoom in and out. You will also see, as additional spatial references to the users, the latitude and longitude location at the mouse pointer in labels at the mouse move event. You will see that information in the decimal degrees format and in the Degrees Minutes Seconds format.
For those that don’t have the Desktop Edition, you will find the zip file “LatLongGraticuleServices” for the Service edition. It is using exactly the same GraticuleAdormentLayer class.
In the future, we will offer another class for graticule with more options for formatting and displaying the graticule. It will also offer projection support for map that are not in Decimal Degrees map unit.
One of the most exciting new features in MapSuite 5.0 is native TAB file support. In the past, the FDO extension was used for displaying TAB files in MapSuite. Now with the new TabFeatureLayer, we have a simpler and more stable method of working with TAB files.
This Code Community project demonstrates how to load and display a TAB file using the new TabFeatureLayer. The example also allows you to add, edit and delete features from the TAB file.
In many atlases, you can see maps with a numbered grid to give the page reference for a more detailed map. In today’s project, we show how to construct such a grid. Based on the extent of the feature, the number of columns and rows, a grid can be created with the page number in each cell.
In today’s project, we are looking at a way to encrypt shapefiles to prevent them from being used outside the application. We show how to encrypt and decrypt shapefiles using streams. You will see that a very simple encryption algorithm is used but by looking at the example, you will be able to implement your own.
Disclaimer: This encryption system can be used only on small shapefiles due to the amount of memory used. A typical use would be to encrypt some valuable small shapefiles you don't want your users to access. In the future, Map Suite will provide a full encryption system as an API.
Today’s project is a tool of ENC Viewer for displaying unencrypted Electronic Navigational Charts (ENCs) available in the S-57 exchange format (*.000).
This tool takes use of Map Suite HydrographyExtension to display ENC data in compliance with the latest version of ECDIS Presentation Library Edition 4.0, which is defined by the International Hydrographic Organization (IHO) in the special publication S-52.
NOTE: the styling file “NauticalCharts.xml” for drawing S-57 (*.000) file is included in the source code package.
This sample demonstrates how to read GPS EXchange Format file(*.gpx) with Map Suite. GPX (GPS Exchange Format) is a light-weight XML data format for the interchange of GPS data (waypoints, routes, and tracks) between applications and Web services on the Internet, which you can find more information:here. Now Map Suite supports the GPX 1.0 and 1.1 schema. This sample works with Map Suite development branch daily build 7.0.275.0 or later.
This sample demonstrates how to display unencrypted Electronic Navigational Charts (ENCs) available in the S-57 exchange format (*.000). It follows the style schema defined in the latest version of ECDIS Presentation Library Edition 4.0 (S-52), which is published by International Hydrographic Organization (IHO).
NOTE: This sample works with Map Suite development branch daily build 18.104.22.168 or later, Map Suite Unmanaged Dependencies 22.214.171.124.msi or later needs to be installed.
This sample shows how you can display a subset of a shapefile without splitting the physical shapefile. For example, you may have a single shapefile that contains both highways and local roads. To improve display speed, you may be temped to split it into two separate shapefiles so you can quickly display local roads with one style and highways with another style (and avoid using a value style, which can be slow). But at this project demonstrates, rather than split your shapefile you can simply build two custom indexes, one for each road type. Then, when you create your ShapeFileFeatureLayer, you'll simply use your original shapefile and specify a custom index. Each custom index will limit the records that can be seen by the Layer, making it very fast and efficient.
This sample demonstrates how you can read data from an CAD file(*.dwg, *.dxf) in your Map Suite GIS applications, and how to render it with CAD embedded style as well as a customized style. It works with Map Suite daily development build version 126.96.36.199 or later, and Setup Unmanaged Dependencies 188.8.131.52 or later needs to be installed to make the sample work. This Cad File support would work in all of the Map Suite controls such as WPF Desktop Edition, Silverlight Edition, Web Edition, MVC Edition. The CAD dependencies assemblies can be downloaded from http://wiki.thinkgeo.com/wiki/File:MapSuiteCADDependencies184.108.40.206.zip
This sample demonstrates how you can read data from an Tab file(*.tab) in your Map Suite GIS applications, and how to render it with Tab embedded style as well as a customized style. It works with Map Suite daily development build version 220.127.116.11 or later. This Tab File support would work in all of the Map Suite controls such as WPF Desktop Edition, Silverlight Edition, Web Edition, MVC Edition.
In the project “North Arrow”, you saw how to extend AdornmentLayer to create a North Arrow AdormentLayer. In this project, we expand on that idea and create a more sophisticated class. You will see how you can combine two images to create a compass. Compare to “North Arrow” project, we also added some other handy properties such as a Position property. Also, the compass can be of varied sizes thanks to the SizePercentage property. Finally, if you pass just one image, the compass can behave just like a regular north arrow.
We also added new designs of compass in smaller version. See the attached file: Rotating Compass New Smaller Designs.zip
This sample demonstrates how you can read data from an ESRI FileGeodatabase in your Map Suite GIS applications. The sample will read data from 3 tables of one FileGeodatabase, and you will find the code as straightforward as consuming any other data source in Map Suite. It works with Map Suite daily development build version 18.104.22.168 or later, and you will need to run the “Setup Unmanaged Dependencies” installer from your daily build package in order for the sample to work The FileGeodatabase sample works in all of the Map Suite controls such as WPF Desktop Edition, Silverlight Edition, Web Edition, MVC Edition and so on.
This sample shows how to hook up external data to shapefile. The US states shapes are from a shapefile while the population values for Washington and New York come from an external database. From this sample, we can see how to use the event FeatureSource.CustomColumnFetch to introduce an external data source and utilize Dictionary objects to cache the external data.
In this sample we show how you can use Map Suite to add isolines (commonly known as contour lines) to your .NET application. Isolines are a way to visualize breaks between different groups of data such as elevation levels, soil properties, or just about anything else you can imagine. This sample also shows the various steps in creating isolines, including the gathering of point data, creating a grid using interpolation, and finally, picking your isoline break levels. We also quickly dive into some more advanced options such as generating isolines on the fly.
To bring this all together, check out our instructional video that will walk you through the process of setting up and working with isolines in Map Suite.
Please note that you will need version 22.214.171.124 or newer of Map Suite in order to use isolines. For more information on how to upgrade, see the Map Suite Daily Builds Guide.
From 126.96.36.199, the sample has been updated that polygons can also be returned as IsoLines results. You need version 188.8.131.52 or newer of Map Suite in order to use this sample.
In this sample we show how you can generate isolines (commonly known as contour lines) using Kriging Interpolation Models. We integrated 5 Kriging interpolation models (Circular, Exponential, Gaussian, Linear, Spherical) in Map Suite which you can see from the sample are powerful and very straightforward to use. It works with Map Suite 184.108.40.206 or later.
One of the most requested features left out of Map Suite 3.0 is MapShapes. For those who are not familiar with MapShapes, in Map Suite 2.0 they were a group of self-contained features that had their own styles, projection and column data. This meant that each one could be unique; however, this also meant you had to specify all of the attributes about each single MapShape.
In working with customers using MapShapes for a number of years, we found a common pattern. First, users tried MapShapes by adding one to the screen. This was very simple and got them up and running fast. They next added a few more as they started to build more of their application. After a short amount of time they realized that it was cumbersome to set the projection, styles, zoom levels, etc. on so many MapShapes, especially since the MapShapes often represented the same kind of underlying feature, like a fire hydrant or road block. The problem was that there was no good solution with Map Suite 2.0 to handle lots of very similar dynamic features.
In designing Map Suite 3.0, we took this into account and created the InMemoryFeatureLayer and InMemoryFeatureSource. These allowed you to treat all of the same kinds of similar features as if they were one group, which solved many problems. What we later found was that it made it more difficult for the cases where you truly had dozens or hundreds of features that were each unique and you needed to represent them as such. Having not implemented MapShapes, we were caught with a hole in our offering.
To fill this gap, we are presenting a project for a simple MapShapeLayer. This is a simple version of a more powerful one that we will include as part of the core framework in the near future. What really struck us when we were creating this new Layer was just how easy it was to do! It is a testament to our 3.0 framework and we decided to include the section below on how we implemented it.
Notes from the developer:
Success! This was about as easy as I thought it would be. All of the heavy lifting was done by existing classes and all I needed was a little glue code. In retrospect, I would had liked to do this by inheriting from the FeatureLayer and FeatureSource, because then it would have made the layer accessible by spatial queries. In the interests of time, and so I could post this on our forums as fast as possible, I inherited from Layer, which is really simple. You can see that the comments and my notes here take up more room than the code itself!
I think you will find this works nearly exactly as the 2.0 MapShapes did. It doesn't support projection; however, I think this could be easily added. We will be creating a production version of this class to include with the framework in the near future, and if projection is indeed easy to add, it will support projection and spatial querying.
In a nutshell, what I did was to create a MapShape class that housed a ZoomLevelSet and a single Feature. The ZoomLevelSet has all of the zoom levels, styles, etc. on it, so that part was nice to reuse. I matched this up with a new kind of Layer. I created the MapShapeLayer by inheriting from Layer. The only required overload was Draw, which was nice. I added to the class a MapShape's GeoCollection to store all of your MapShapes. In the Draw I simply looped through the MapShapes, and for each of them I found the zoom level that would be drawing and called its Draw method. In just a few lines of code, it all came together.
This project shows how to create a simple mini map to give a reference of where you are when you zoomed in. As for WaterMarkAdornmentLayer, the MiniMapAdormentLayer inherits from AdornmentLayer.
MapSuite API has RasterLayer from which inherits MrSIDRasterLayer and ECWRasterLayer etc. If we have many raster files, we would need to add all the raster files as separate layer. However this has a performance issue. In this project, we show how to create a class MultiGeoRasterLayer that treats all the raster file as one layer.
This class show how to do that using JPEG images with its associating JGW world file. It speeds up the loading of a large number of Raster layers by loading and drawing on demand only the files in the current extent. It loads a reference file that contains the bounding box, path and file information for all of the Raster files. We load this information into an in-memory spatial index. When the map requests to draw the layer, we find the Rasters that are in the current extent, create a layer on-the-fly, call their Draw method and then close them. In this way, we load on demand only the files that are in the current extent.
Today our purpose is to gather into one concise project all the different knowledge we learned about multi index in various Discussion Forum posts such as:
Consolidating various physical shapefiles into one layer is a flexible and clean way to handle your data. Thanks to multi index, you can treat your layers as one. Depending on your needs you can choose to use all the shapefiles in one folder or only a few. In this project you will see the different ways to use the powerful static function MultipleShapeFileFeatureLayer.BuildIndex()
This project demonstrates basically two techniques; How to rotate a map and how to have a North Arrow keeping the right north orientation.
Rotating the map:
To rotate the map, you have to be aware that you have to use RotationProjection class provided by MapSuite API. All the layers need to have their projection property set to RotationProjection. Beware that if a Layer does not have that property set, it will not rotate along with the rest of the map.
Displaying the North Arrow:
As the map rotate, it is important to keep track of the orientation of the map and to know what the direction to the North is. Inheriting from Adornment Layer, RotatingAdornmentLayer class takes an Image representing a North Arrow and with its RotateAngle property set according to the angle property of RotationProjection, it always shows the North correctly.
This project shows the power of MapSuite by giving to the developer the possibility to create its own layer based on an existing format containing spatial information. If the developer is familiar with a certain format like oledb, he can create its own FeatureSource reading the database and its own FeatureLayer wrapping the FeatureSource and providing the drawing logic.
In this project, we create the class OledbPointFeatureSource inheriting from FeatureSource and OledbPointFeatureLayer inheriting from FeatureLayer.
This project shows how you can store your geometry data in any OLEDB compatible database. The sample provides a custom FeatureSource and FeatureLayer that allows you to query, insert and edit a full range of spatial. The spatial data is stored in binary using Well Known Binary and its index is a series of four columns describing the bounding box. This solution does not require your database to support any sort of special spatial indexing as it is all build into table structure and uses plain SQL statements to query back the data. This sample is also a great way to see how it is easy and efficient to extend Map Suite to meet your specific requirements.
NOTE: For portability and allowing the sample to be self-contained with minimal setup we have used a Microsoft Access database. Due to this there is a limitation there the “Microsoft.Jet.OLEDB” engine can only run in X86 mode. This is reflected in the target for this project. If you use another OLDB source then is limitation is no longer applicable.
Map Suite already offers classes such as ScaleBarAdornmentLayer for displaying scale bars on the map but they are limited to certain common units like meters, kilometers, feet and miles. In this project, you are going to learn the basics for creating a scale bar using the unit of your choice. The class CustomUnitScaleBar displays a very simple scale bar but you will find the logic for basics of creating a scale bar. Looking at the code, you will be able to create more sophisticated stylish scale bars for your own needs.
The purpose of this sample is to show you a quick and easy way to read data from a SQL data source and display it on the map using an
InMemoryFeatureLayer. Since geometric feature data can be stored in a number of different formats such as X and Y coordinates, WKT (Well Known Text), and Geometry data types, this sample shows you how to load, edit and save data to a SQL data source for each different type of format. The sample includes a SQL script you need to run first, in order to create and populate a SQL Server table with sample data. You will also need to change the connection information in the code on lines 71 and 204 so that it points to your SQL Server.
Note: The approach in this sample works best for small amounts of data (less than 10,000 features) since it loads all of the data into memory. For larger datasets, we recommend using the
SQL2008FeatureLayer or the ''OledbFeatureSource'', which only reads the data for the given extent you are working in (much more efficient for larger datasets).
In this WPF project, we show how to build an InMemoryFeatureLayer from a text file. You'll notice how the columns are set up so that styles can be used as if the InMemoryFeatureLayer were a static layer such as a Shapefile. Here, we apply a Class Breask Style and a Text Style to our InMemoryFeatureLayer. What we learn in this sample can be applied to all the different editions of Map Suite.
In today’s project is going to apply some of the techniques we learned in the previous projects to some swine flu data available on the web.
On the web site
http://www.mapcruzin.com/free-download-h1n1-swine-flu-arcgis-shapefile.htm, it is possible to download point based shapefiles of swine flu occurrences in the world. While this information is valuable, it is a little difficult to display it at world level. At high zoom levels, all the points are on top of each other making the map very difficult to read and get overall information of the swine flu situation at the world level as you can see in the image with the map of the upper left.
Using some the techniques we used before such as Spatial Join with some modification, we can create a new polygon based layer from the country layer adding info from the swine flu layer. That resulting layer can be displayed with the info being a lot more readable as you can see in the map of the lower right corner of the image.
We basically use the techniques we saw in the “Spatial Join” project with getting the info from the swine flu layer into the country layer based on spatial relationship. We also use the techniques from “Dissolve with statistics” for doing some statistics on the swine flu records according to what country they belong to. See the comments in the project for more details.
Keep in mind that the project is for shapefile data format, if there are people expressing interest for doing the same thing with other data format, we will create a new more generic project.
This project shows how to create a WaterMarkAdornmentLayer class inheriting from AdormentLayer. Notice that in the overridden method DrawCore, the drawing is done using screen coordinates. This is a characteristic of Adornment Layer and any layer inheriting from it. In this example, the code in the DrawCore method places the water mark text at regular interval but you could easily modify the code to have the water mark text placed randomly on the map. Notice that WaterMarkAdornmentLayer is added to the StaticLayers collection of the MapEngine meaning that you can place this adornment layer on top of all the other layers or between any other layers. This class is useful for providing demos to clients.
This project shows how to consume data from a WMTS Server using WmtsLayer. You would find the code pretty straightforward, just like displaying a shapefile, while behind the scenes we request tiles from the server asynchronously and efficiently, and stitch them into a proper map.
This class is introduced from version 220.127.116.11, besides this WmtsLayer, we also have WmtsOverlays in different products. For example, this is the WPF WmtsOverlay Sample.
In our “How Do I” apps, there is sample app that shows how to add graphs to the map using the ZedGraph library. In this project, using the same data, the US cities, we elaborate a little bit on the pie chart. You will see how to add some gradient colors to the chart, how to label the different pie slices, how to add a title etc. Zedgraph is a truly massive library for graphics and Pie chart is only one type of chart among many others. As you can add pie charts to your map, you can also add bar charts, trend charts etc. I suggest you check out this site for more info on ZedGraph http://zedgraph.org/wiki/index.php?title=Main_Page With Map Suite, you have the whole ZedGraph API available with an easy interface to add the graphs to the map. For this project, in addition to the MapSuiteCore.dll, you will also need the ZedGraph.dll and ZedGraphStyleExtension.dll references. We will have several projects showing how to integrate other types of charts to your map.