Sparkblog

Using Prepared Geometries in Shapely

Posted by: Will Cadell in postgis open source tools code shapely 4 years, 6 months ago

Shapely is a great tool for the geospatial developer.

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Sparkgeo and Google Maps

Posted by: Will Cadell in mapping web development google maps 4 years, 8 months ago

At sparkgeo we build next generation web mapping applications. That means we need to consider the mapping application from conception to delivery, from database to user expeirnce. Because we usually get to choose which mapping fabric we leverage, we will usually choose Google Maps.

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GDAL & OGR clipping (hack)

Posted by: Will Cadell in gdal mapping technology open source tools GIS 4 years, 8 months ago

Today I had to clip a raster image by 102,000 polygon features. With out doubt this task demanded automation. I decided to try my hand at python coding using the excellent GDAL library. I had this great idea that i could do the whole thing nicely in GDAL, but i was foiled by time (or not enough of it) and I did half of the process in a pure GDAL script then I dropped to the cmd line to execute gdal_translate with a changing projwin per iteration. In case you are unaware with the gdal library comes a series of astonishingly useful utilities. I used to use the FWTools port but now I use the OSGeo4w one instead. There are a number of raster processing wonder-tools in here, and gdal_translate is one of them! Back to my script, I realize now that in actual fact i am using almost exclusively OGR pieces of GDAL, confused yet?. Its simple: GDAL = rasters OGR = Vectors I start by importing:

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PostGIS to PostGIS via ogr2ogr

Posted by: Will Cadell in technology code ogr2ogr gdal postgis GIS open source tools 4 years, 8 months ago

OGR2OGR is a hugely useful GIS utility. Today I was using it to copy data between an Amazon Web Services (AWS) based PostGIS database and a local PostGIS database. This is a slightly weird use case, but I wanted to pull down some data locally for editing via Quantum GIS (QGIS).

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Manage your mobile workforce - workshop

Posted by: Will Cadell in technology 4 years, 8 months ago

Learn about how to manage your mobile workforce using Google Maps Coordinate.

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