Digital Geography

Python for Geospatial Data Analysis (Part IV)

GDAL Geotransforms and World Files The last post in this series considered how to write a geospatially aware file, in that case a Geotiff. In the example the projection and geotransform were read from a file and written into another file with no modification. That worked for the simple example, but isn’t necessarily the most common use case for that type of subroutine. Often you may want to adjust the data based on your analysis. Most geospatial professionals are probably familiar with world files, or have at least run across them. They are a good way to georeference data that…

projections, ellipsoids/spheroids, coordinate systems, datum and all this crazy cartographic stuff.

We will go straight to the main part of the problem:how to communicate, where you are. Sometimes it is as easy as “one, two, three” but most likely it is as you are talking in another language compared to your listener. Let us assume you say something like “I am in the mall 500m northwest of the church”. Well there is plenty of information in it. More after the break!