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…

image georeferenciation using ArcGIS 10

Due to a recent article at our German partner geo-works.de I would like to share my two video tutorials for doing this. The first concentrates on the so called image-to-map georeferenciation. Imagine you have some aerial picture that clearly shows a very significant landmark. If you have the real-world geo-coordintes of that you can easily use this method to get your aerial photo joined by a georeference: Another thing is the usage of already georeferenced data like satellite images or shapefiles. This is the so called image-to-image georeferenciation (which is still similar to the mentioned above): So enjoy your new…