![]() ![]() They’re next to each other, and they share one border. Imagine two adjacent parcels-land use parcels, agricultural fields, that sort of thing. Let’s start with what topology is for vector data. WHAT IS THE VECTOR TOPOLOGY ENGINE OF GRASS? Whatever format you bring to GRASS, it will be reprojected on the fly, and you’re ready to work. It’s never been standardized or widely exposed at an international level, like GeoTIFF, GeoPackage or shapefile, but it’s similar to those.Įvery format comes with limitations, and this format-a better representation in many regards-minimizes the loss when storing data. WHAT’S THE DATA LIKE IN GRASS?īecause it’s existed since the 80s, GRASS has its own data format. When you open up GRASS, the first thing you’re asked is to choose what Location and Map Set you want to work on.Ĭoming soon, in GRASS 8.0, we’ll do away with this opening screen and you’ll start as you would with most other GIS-a menu. In that case, you can reproject it on the fly. Suppose your data comes from various places and arrives in different coordinate reference system projections. If you need to reproject data you have to consider precision and the method of resampling the raster data, among many other things. The system of Locations keeps data clean and avoids mixing. The map set(s) help you organize your data even further. It’s here where all your data is stored, and you can have one coordinate reference system for each. Locations (or Projects) can refer to only one geographic place or area of interest, but it can be as large as the globe. These are called Locations in GRASS, a legacy name from the good old days. It’s there for you to organize and store your data. The GRASS database is a folder/directory on your desktop or network drive. It’s used as a back end in many projects in QGIS, where you have access to much of the GRASS functionality. Works on desktop, laptop, as a standalone app, or with GIS software. It’s a powerful raster vector and geospatial processing engine-suited for all kinds of analysis. The project is open to anybody and businesses use it as a back end tool for analysis. Today it’s a global team on GitHub that keeps it up to date with the geospatial world-they integrate new formats, ideas, and algorithms all the time. ![]() The US Army developed it originally and in the early 90s, academia took over the development. It’s an open source software that’s been around for over 35 years. GRASS stands for Geographic Resources Analysis Support System, and it’s a founding member of the Open Source Geospatial Foundation ( OSGeo). First, as a student for academic and research purposes, and then as a developer monitoring infectious disease and processing satellite data. Markus has been using GRASS since the 90s. GRASS is a free and open source geospatial software with a well-documented history and plenty of functionality. He is also the Chairman of the GRASS GIS Project Steering Committee. GRASS GIS probably doesn’t get the attention it deserves ![]()
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