For any project with spatial implications, a SWOT analysis is a necessary first step. Given time and budget, an engineer can produce a myriad radically different solutions about the development of a plot of land. If allowed to brainstorm, he can conjure solutions that will cost twice or thrice the budget, solutions that are too taxing on the environment or incompatible with the local customs and necessities. Since brainstorming paves the way for actual project development, the team needs an efficient, rational way to cut the bulk and allow them to focus on the fewer solutions that are for example, within budget, eco-friendly, and most profitable. … More SWOT Analysis as a Basic Index in Spatial Development Projects
The Georeferencer Plugin is a tool for generating world files for rasters. It allows you to reference rasters to geographic or projected coordinate systems by creating a new GeoTiff or by adding a world file to the existing image. The basic approach to georeferencing a raster is to locate points on the raster for which … More How to Georeference Data on QGIS
For the automatic change detection of man-made objects, at first the Chan-Vese model will be used. Code for the model in Python found on GitHub and modified to detect man-made objects and compare them by using multitemporal data. This approach is widely applied in medical applications (example given bellow). The Chan-Vese Model The Chan-Vese level … More Automatic Change Detection Algorithm of Man-made Objects (ACDA)
The best way to represent earth is a globe. Earth is close to a sphere (or an ellipsoid) but it’s not actually one. But globes are hard to carry in your backpack, you can only see one side of the globe, it’s hard to measure distances and they’re just not as convenient as paper maps. … More Map Projections
Empirically derived NDVI products have been shown to be unstable, varying with soil color, soil moisture, and saturation effects from high density vegetation. SAVI is a transformation technique that minimizes soil brightness influences from spectral vegetation indices involving red and near-infrared wavelengths. The index is given as: where L is a canopy background adjustment … More Soil-Adjasted Vegetation Index (SAVI) Python Script
Orfeo ToolBox (OTB) is an open source project for state-of-the-art remote sensing. Built on the shoulders of the open-source geospatial community, it can process high resolution optical, multispectral and radar images at the terabyte scale. A wide variety of applications are available: from ortho-rectification or pansharpening, all the way to classification, SAR processing, and much … More Orfeo Toolbox (OTB): A powerful open source box for RS applications
After the “What is NDVI?” post I decided to create a Python Script for NDVI. This script works with a *.tif NIR band and a *.tif RED band and gives as output a new NDVI image in *.tif format. To run this script, it’s important the name of the RED band to be “red.tif“, the name of … More NDVI Python Script..