A ‘Unknown Spatial Reference’ means there’s a datum conflict.
In this case, ‘unknown units’ will appear in the bottom right corner of Arc Map and you should use the Define Projection tool.
There are solutions for practically EVERY GIS problem.
It also allows you to define custom CRS and supports on-the-fly projection of vector and raster layers. Unwrap thousand of gifts like government data, detailed basemaps and crowd-sourced information.
Both Arc GIS and QGIS handle CRS in a user-friendly way. The basic Arc GIS license gives you access to Arc GIS Online – a GIS data goldmine.
We navigate you through the differences between Arc GIS and QGIS because you’ll be more efficient and more advanced of a GIS user.. (Because setting custom delimiters in QGIS is even better than Microsoft Office.) Instead of poring over piles of conflicting and confusing GIS formats, simply consume it with QGIS. These applications help many manage their raster, vector and GIS data. Both QGIS Browser and Arc Catalog help to easily navigate in your filesystem and manage geodata…
It’s a head-to-head GIS software showdown with the star-studded lineup in the GIS industry – Arc GIS vs QGIS.. Arc GIS has broken more hearts than anyone for consuming data. You never realized how powerful the Arc GIS “Add Data” could be, did you? They give basic preview functions but the focus is on data access and organization. The edge goes to Arc Catalog because of its options. In QGIS, you can join tables with the layer properties. The first data set you add to Arc Map determines your coordinate system.
Other options are to filter (reclass or extraction tool sets) or simplify data (generalization toolset). There are groundwater and solar radiation tools in QGIS, but not like Arc GIS We could continue. It’s difficult here to pin down a winner, as both stand out for having a plethora of raster manipulating options.
In QGIS, the raster calculator tool performs map algebra with a little less math and trigonometry functions. Ordinary and universal kriging are separate tools in QGIS, but in Arc GIS it’s a radio button under the kriging tool. Have you ever tried to assemble furniture without the instruction manual? When you run tools in the Arc GIS Geostatistics Toolbox, the instructions and output explanations are so clear that a child could understand the results.
We all know you can engineer specialized analyses with plugins.
QGIS has boatloads of plugins to solve everyday GIS problems. But what you may not have known is that Arc GIS has plugins too.
The bottom line is that Arc GIS Online (AGOL) is a rich source of GIS data. An advanced license gives you access to everything.
It helps you analyze and make even more powerful and knowledgeable decisions. Arc GIS is the villain forcing you to connect to your license. Now this part is important: There are no license levels in QGIS.
There’s tool integration with GRASS and SAGA GIS, this gives you the necessary horsepower at your disposal to solve almost every geospatial problem.