What are Satellite/Sensor Characteristics

Satellite/Sensor Properties for Image Processing This article will bring information and characteristics of satellite/sensor.   It is very important to know the characteristics of satellite image , this help user to select and acquire satellite image as per need of research and project.  Image can be select based on mapping purpose and for this basic properties are very important for selection of satellite image, which are below- Spectral Resolution Spatial Resolution Temporal Resolution These properties play significant role for better image classification as per requirement of project. These properties will help to select appropriate image as per need of project for example in first case, spatial resolution may be important if detail information required but in other case if repeatedly satellite images required then temporal resolution become important. Instead of these resolution swath of satellite image is also important as it describe the coverage of satellite imag

How to Process Cartosat DEM using QGIS- Reproject, Clip and Stream Generation

This article is the continuation of an earlier article on downloading and processing of Cartosat DEM. In this article, processing of DEM is explained such as re-project, clip and fill the Gaps and remove errors present in DEM. These corrections can be performed using GIS functions . Reprojection is needed for correcting geometric errors present in DEM as well as convert the projection system one to another.  GIS tools can be used to Clip DEM and it is very important especially for watershed delineation, for this clipping boundary based on study will be used. Error present in DEM is defined as sudden extreme high  and low  values occur in comparison to surrounding values.   Step 1 –  Re-project the mosaic DEM using QGIS Here we will change the CRS from Geographic to UTM. For this click on Raster then Projections followed by Warp (Reproject) . Warp (Reproject) window will popup. Here define Input layer

How to Download Cartosat DEM Through BHUVAN Portal

Cartosat DEM Download and Mosaicing Process using QGIS This article is prepared to discuss steps to download Cartosat DEM through bhuvan portal . As this DEM downloaded in tiles so one may need more than one DEM tile for study area.  Therefore it is necessary to mosaic these tiles to make a single tile of DEM. In this steps of both processes- download and mosaic are shared to create DEM, which can be further used further for different remote sensing and GIS based applications. Such as  Agricultural Studies Wetland studies Watershed Studies Runoff and Sediment Discharge Studies Urban Sprawl Mapping Transport Studies etc. Step 1 -  Download freely available DEM data using NRSC-Bhuvan website Open weblink: From this page go to top menu option –  Open Data Archive A new window will open after clicking on Open data Archive. You need to make user id on this page, so click to  Login (on the extreme top right corner) Aft