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Using OGR to Visualize Data
posted by Satri
on Tuesday January 22, @06:12PM
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from the no-extensive-coding-required dept.
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from the no-extensive-coding-required dept.
Spatially Adjusted late in December discussed a simple yet revealing example of using OGR to visualize data. From SA: "Take GDAL/OGR for example, the webpage probably scares off most users because of the lack of examples of how to use both toolsets. But the tools themselves are so easy to use this shouldn’t scare anyone off. [...] That said Tom Kralidis has a great example of using OGR to convert a Microsoft Excel file to KML. GDAL/OGR is integral to so many GIS applications (even ESRI uses it) that any GIS professional should have at least a basic understanding to how it works."
GDAL/OGR 1.5.0 was released late last year and see also this story when OpenLayers revealed itself as a data converter and an example of using a one OGR command to publish a point shapefile to html.
Related Stories
GE-Graph: Nice Graphs for Google Earth
[+]
The Free GeoTools blog describes GE-Graph, a free (Windows-only) tool to add beautiful graphs in GoogleEarth (numerous screenshots). Some of the features from the official website: "# Make Bars graph
# Make graph with geometrical shapes (circles, squares, triangles, etc).
# Set the shape size according to each placemark value
# Also set the shape color according to a placemark value
# Graph's title and color scale as GE screen overlays
# Different choice of label content (place name and/or value)
# Different color scales to be chosen
# Paste files from other applications (Word, Excel, Access,...)
# Export data to Excel
# Sort and filter placemark data (coordinates, names and value)-not for shape files
# Save file as kmz("
Technology: Comparing FDO, GDAL/OGR and FME
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The PerryGeo blog ask an interesting question about comparing FDO, GDAL/OGR and FME. From the blog: " FDO, GDAL and FME all seem to operate in roughly the same domain - Providing a data model, API and tools to translate between spatial data formats. Does anyone know of any good write-ups comparing/contrasting the features of these three libraries?" Read the very informative answers on the blog. See also related stories below.
Technology: OpenLayers as Data Converter, GDAL 1.5 and URLs, and Shapefile to html
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Here's a few recent geoblog entries that I found interesting on the topic of tools to share information. First is the ability to use OpenLayers as a data converter: " OpenLayers Data Conversion is a new service that allows easy conversion from any of the formats that OpenLayers supports to any of the formats that OpenLayers supports. Simply paste your data, choose your format, and hit convert." Next is the capacity of GDAL 1.5 to import spatial references from URLs using, as an example, the SpatialReference.org website. And finally, PerryGeo demonstrate a quick way to publish a point shapefile to html, using a single command.
Major GDAL/OGR 1.5.0 Release, Proj.4 4.6.0 Also Released
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The OSGeo-Announce mailing list informs us the open source GDAL/OGR 1.5.0 has been released. Considering the almost ubiquitous use of GDAL in open source and proprietary software, this is doubtlessly great news, especially with the numerous new drivers included for 1.5.0. Mateusz Loskot provides a few statistics: "more than 420 tickets closed on the Trac, implemented 17 new GDAL drivers for raster formats, and 4 new OGR drivers for vectors, implemented 4 (5 counting RFC 16) RFC documents, added 5 new command line utilities, plus, big number of features and improvements in SWIG bindings for scripting languages." In related news, Proj.4 4.6.0 has also been released.
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