I need a gmted2010 height map of Massachusetts. Only Massachusetts, including its shoreline, islands, and of course state boundaries.
What I am currently doing, in bullet point form:
I am using https://earthexplorer.usgs.gov/ - this is where I select a predefined area to get Mass. Though it sounds like I will get the option to download a Mass heightmap, I get the entire New England area + more.
Once I have options to download the heightmap, I have selected the 7.5 arc.
I input all heightmap files into QGIS, where they all layer on top of one another.
I retrieve the Shapefile from Mass.gov - I am using the 25k Polygon for the stat of MA.
I select the Open Datasource Manager and select Vector and upload the 25k polygon. In the processing toolbox I select clip raster by mask layer.
Once I get the "final image" I am left with an image that does not follow the border around states, the shoreline, and outlying islands. Rather I get the raster effect. I have added two pictures below so you can see what's going wrong.
Essentially, I need the heightmap of Massachusetts. I am making some mistakes along the way. I think it might have to do with how the image from USGS is a raster, and I am using a polygon in Vector form.
In other words, the idea is that the heightmap should be identical to the mask. I should be able to export a high quality TIFF of that heightmap.
Would someone be able to provide a step by step process of how I might be able to get a heightmap of Massachusetts? (or other state or select location, and not have parts/area missing through raster in my "final image."