Rioxarray is a python package that is built upon xarray and rasterio packages to facilitate the analysis of raster or xarray datasest. In this article, I show an example of how I read and visualize raster data using rioxarray. This
Geodesy is the science of measuring the orientation, shape, size and gravity of the earth as well as the variation of these properties over time. Conventionally, these measurement is done using various surveying and astronomical equipment such as levelling, GPS,
Interferometric Synthetic Aperture Radar (InSAR) is based on the analysis of the phase difference between two images with different viewing geometry. You can read more about InSAR here. In this article, I will outline the steps for creating DEMS using
SAR data contains Amplitude Α and Phase Ø. Amplitude is the backscatter which depends on surface roughness and dielectric constant of the scatters. In Interferometric SAR (InSAR) we are work with phase variation. Phase is the fraction of a fully
The calibrated backscattered measured by a SAR sensors is described using Radar Cross Section(RCS) σ, which is defined as the ratio between the received and incident signal intensity. σ = Ireceived/Iincident . 4πR2[m2] The RCS is not usually easy to
The side looking property of radar systems, surface slopes and other terrain features causes geometric and radiometric distortion in image data acquired by SAR systems. The geometric distortion are foreshortening and layover. The radiometric distortion results in shadow. If a
In one of the previous posts, I discussed the principle of Side Looking Airborne Radar (SLAR) systems. In that article, we established the formula for the azimuth resolution of SLAR systems as: PA = λR/L = λH/L cosØ = βH/cosØ
Besides the crucial merit of all-day and weather observation capability, radar systems interact with earth features differently than other imaging systems thereby providing additional information that would otherwise be impossible to derive. While optical and thermal sensors records the solar
There are many platforms to download DEM and other topography data. One platform that I found very useful is open topography. There are huge varieties of topography dataset such as high resolution topography data, point cloud data, global and regional
If you want to download free vector and raster data of administrative boundaries for your GIS work, check Natural Earth Data. The platform has its menu at the center with many options. You might wan to check the home, features,
The first time I heard of the word was during a business Orientation program by the CEO of tantalizer. Since then, I had thought of writing something relating to the ‘ three princes of serendip’ who were always making discoveries
Although the application of radio detection and ranging (RADAR) in detecting objects began in the 20th century, the history of radar dates back as far back the development of electricity, magnetism and electromagnetism. In 1780, Italian physicist Luigi Galvani and
Radar stands for Radio Detection and Ranging. A radar measures the range or distance to an object by transmitting an electromagnetic signal to an object and receiving the echo reflected by the object. Since electromagnetic waves travels at the speed
Rasters are made up of gridded cells of equal dimensions called pixels that represent areas on the earth surface. Here I show how to open and explore single band tiff file using rioxarray.
