I wrote an article not long ago, using ArcGIS to extract the boundaries of raster images, using the ArcGIS mosaic dataset function, friends who are interested in this knowledge point can read the following article.
[arcgis learn a little every day] method to quickly obtain raster image boundaries
In the past few days, I found that using Global Mapper to achieve the same effect has fewer steps and faster speed, just one simple step! Next, Wang Shitou will introduce this method. It needs to be explained here that what we extract is the boundary of the effective value of the image, that is, the value around the image is Nodata, as shown in the following figure:
The operation steps are as follows:
1. Load the image in the Global Mapper software;
2. Click Layer--->Create layer coverage frame/polygon area primitive;
3. In the pop-up interface, if you want to obtain the boundary of the effective value of the image, you should choose No-Create a polygonal coverage area. Of course, if you want to obtain the circumscribed rectangle of the image range, you should choose Yes-Create a rectangular area;
4. The GM software can directly obtain the boundary of the image after calculation;
5. The GM software acquires the surface covering the image,
The effect of filling with transparency and overlaying with the image is as follows:
Summarize:
Compared with ArcGIS, Global Mapper's method of extracting image boundaries is simpler and faster!