There is a concept of spatial auto-correlation in GIS (Geographic Information Systems). This is a measure of the degree to which a set of spatial features and their associated data values tend to be clustered together in space (reference). So in small words: similar things tend to hang out together. This is often true of […]
Analytics are a great tool for monitoring and reporting on website traffic and user interactions. It is reasonablely expected that, as a web developer I will use analytics to better understand my users and deliver them with incrementally improving services and experiences. At Sparkgeo we build web maps. We have been doing this for half a […]
Dustin Sampson (@gridcell), one of our geospatial developers presented the core ideas behind tracking slippy map analytics at FOSS4G in September (2014, Portland). Check out his presentation here >>> Presentation Description Google Analytics is a great tool for monitoring and reporting on website traffic and user interactions but what it doesnt tell you is that […]
This is a quick note on how to map images in a directory purely from their exif files. An exif file is one which contains the meta data of the image. If the image was taken by a phone of GPS enabled camera, then a location will also be contained within that file. To read […]
GeoJSON is a great format, easy to read/view/use but one thing that really stands out is the verbosity of numbers and its effects on file size. Yeah in rare cases it “may” be needed but I’m pretty sure a length that is precise to, well less than a millimeter (example: stream length: 6849.41980435 meters) is […]
It is not uncommon for raster data to be large and unruly. Creating tiles is one way to deal with these large datasets and speed up rendering. This post introduces a few handy tools for dealing with raster data while walking through the process of combining multiple raster files to create tiles for a super-overlay […]
When talking with clients there is always a turning point in my mind where their request turns from being a “Google Map” to being a “web mapping application”. It is usually where data is being filtered, updataed, or when ‘users’ are mentioned. This a pivotal point where the project both gets more interesting, a lot […]
