Height map for RasterBaseCoordinates not found

[LaurentBerder]

Hi,

I'm trying out your package, and start by just running your example code:

# SRTM1 - 30m resolution
>>> from srtm import Srtm1HeightMapCollection
>>> srtm1_data = Srtm1HeightMapCollection()
>>> srtm1_data.get_altitude(latitude=40.123, longitude=-7.456)
615
>>> Srtm1HeightMapCollection().get_elevation_profile(40.123, -7.456, 40.129, -7.460)
[615, 620, 618, 620, 616, 603, 593, 582, 575, 579, 580, 589, 589, 581, 565, 553, 545, 541, 534, 533, 529, 520, 514]

But it just results in this error:

KeyError                                  Traceback (most recent call last)
~\AppData\Local\Programs\Python\Python39\lib\site-packages\srtm\height_map_collection.py in get_height_map_for_latitude_and_longitude(self, latitude, longitude)
     60         try:
---> 61             return self.height_maps[base]
     62         except KeyError:

KeyError: RasterBaseCoordinates(latitude=40, longitude=-8)

During handling of the above exception, another exception occurred:

Exception                                 Traceback (most recent call last)
<ipython-input-9-66c5ddd22251> in <module>
----> 1 Srtm1HeightMapCollection().get_elevation_profile(40.123, -7.456, 40.129, -7.460)

~\AppData\Local\Programs\Python\Python39\lib\site-packages\srtm\height_map_collection.py in get_elevation_profile(self, start_latitude, start_longitude, end_latitude, end_longitude, apply_earth_curvature)
    116         for latitude, longitude in converted_points:
    117             elevations.append(
--> 118                 (latitude, longitude, self.get_altitude(latitude, longitude))
    119             )
    120 

~\AppData\Local\Programs\Python\Python39\lib\site-packages\srtm\height_map_collection.py in get_altitude(self, latitude, longitude)
     68     def get_altitude(self, latitude: float, longitude: float) -> int:
     69         """Get the height of the given latitude and longitude"""
---> 70         height_map = self.get_height_map_for_latitude_and_longitude(latitude, longitude)
     71         return height_map.get_altitude_for_latitude_and_longitude(latitude, longitude)
     72 

~\AppData\Local\Programs\Python\Python39\lib\site-packages\srtm\height_map_collection.py in get_height_map_for_latitude_and_longitude(self, latitude, longitude)
     61             return self.height_maps[base]
     62         except KeyError:
---> 63             raise Exception(
     64                 f"Height map for {base} not found. Have you called "
     65                 f"build_file_index() on your heightmap collection?"

Exception: Height map for RasterBaseCoordinates(latitude=40, longitude=-8) not found. Have you called build_file_index() on your heightmap collection?

[adamcharnock]

Hi @LaurentBerder,

Sorry for the slow reply. Did you set the environment variables mentioned in the README? These are:

export SRTM1_DIR=/path/to/srtm1/
export SRTM3_DIR=/path/to/srtm3/

If this is indeed the problem, then I think I could make the error message a bit clearer :-)

[LaurentBerder]

@adamcharnock I remember scrupulously following the steps of the README, but it was a while ago, and I kinda gave up on your package.

I ended up adapting this code to my usecase, instead.

[adamcharnock]

No worries @LaurentBerder, I'm sure you followed the README just fine. Sorry it took me so long to get back to you. If this comes up again I'll endeavour to get on it faster :-)

Closing for now, but if anyone comes across this and wants to re-open it just make sure you tag me to ensure I get a notification.

[StorywithLove]

@adamcharnock， I have a doubt.What is the specific path that "path" refers to here

[StorywithLove]

@adamcharnock，我对此表示怀疑。“ path”指的具体路径是什么？ It is already known that the function of the two environment variables is to set the directory of hgt data, and a file in the directory can read the data. However, when multiple data is placed in the directory, it cannot be read, and the same error of this issuse is reported. And the value read is different from the visualization software Global Mapper, the reason is being checked