I am new to GIS and I have to do the following:
- I have a GeoTIFF raster file of a map with some features like clouds and water bodies. It is a satellite image. My images are taken from a snapshot of https://worldview.earthdata.nasa.gov/ which gives me a GeoTIFF file.
- I have to encircle a particular feature like a particular water body or some area of the cloud coverage.
- The area I encircle would give me the coordinates in (lon/lat) of the area so that I can use the coordinates in programming contour plots.
- It is better if I can get the coordinates as a CSV file.
What I have tried so far:
- I added the raster TIFF image.
- Used the New Shapefile Layer Icon to create a disastrous polygon to encircle a particular area.
- A shapefile (vector layer) gets added on top of the raster map.
- I tried exporting the geometry coordinates to a CSV file, but was unsuccessful.
- I tried the MMQGIS plugin and export the shp coordinates to a CSV file, but it was of no avail, because I got only the four boundary coordinates.
Is there any better way in getting around this stuff? Especially in drawing a freeform vector and getting the coordinates of the encircled area.