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
NDVI or Normalized Difference Vegetation Index is a simple graphical indicator that can be used to analyze remote sensing measurements, typically but not necessarily from a space platform, and assess whether the target being observed contains live green vegetation or not. NDVI maps are being used in agriculture (precision agriculture), forestry, ecology and more. Healthy vegetation (or chlorophyll) … More What is NDVI?
A time zone is a region that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions because it is convenient for areas in close commercial or other communication to keep the same time. Most of the time zones on land are … More Time Zones..