Open Topo Data Server Documentation
The easiest way to run Open Topo Data is with Docker. Install docker then run the following commands:
git clone https://github.com/ajnisbet/opentopodata.git cd opentopodata make build make run
This will start a server on
localhost:5000 with a small demo dataset called
test-dataset. Check out the API docs for info about the format of requests and responses.
Open Topo Data supports all georeferenced raster formats supported by GDAL (e.g,
Datasets can take one of two formats:
- A single raster file.
- A collection of square raster tiles which follow the SRTM naming convention: the file is named for the lower left corner. So a file named
N30W120.tiffwould span from 30 to 31 degrees latitude, and -120 to -119 degrees longitude. By default tiles are 1° by 1° and the coordinates are in WGS84, but this can be configured.
If your dataset consists of multiple files that aren't on a nice grid, you can create a
.vrt file pointing to the files that Open Topo Data will treat as a single-file dataset. For an example of this process, see the documentation for configuring EMODnet.
Open Topo Data is configured by a
config.yaml file. If that file is missing it will look for
A config might look like:
max_locations_per_request: 100 access_control_allow_origin: '*' datasets: - name: etopo1 path: data/etopo1/ - name: srtm90m path: data/srtm-90m-v3/ filename_epsg: 4326 filename_tile_size: 1
corresponding to a directory structure:
opentopodata | └───data | ├───etopo1 | | | └───etopo1-dem.geotiff | └───srtm-90m-v3 | ├───N00E000.hgt ├───N00E001.hgt ├───N00E002.hgt ├───etc...
which would expose
max_locations_per_request: Requests with more than this many locations will return a 400 error. Default:
access_control_allow_origin: Value for the
Access-Control-Allow-OriginCORS header. Set to
*or a domain to allow in-browser requests from a different origin. Set to
nullto send no
datasets.name: Dataset name, used in url. Required.
datasets.path: Path to folder containing the dataset. If the dataset is a single file it must be placed inside a folder. This path is relative to the repository directory inside docker. I suggest placing datasets inside the provided
datafolder, which is mounted in docker by
make run. Files can be nested arbitrarily inside the dataset path. Required.
datasets.filename_epsg: For tiled datasets, the projection of the filename coordinates. The default value is
4326, which is latitude/longitude with the WGS84 datum.
datasets.filename_tile_size: For tiled datasets, how large each square tile is, in the units of
filename_epsg. For example, a lat,lon location of
38.2,121.2would lie in the tile
N38W121for a tile size of 1, but lie in
N35W120for a tile size of 5. Default:
An important goal of Open Topo Data is make is easy to add new datasets. The included dataset is very low resolution (about 100km) and is intended only for testing.
Adding a new dataset takes two steps:
- placing the dataset in the
- adding the path to the dataset in
Instructions are provided for adding the various datasets used in the public API:
Unfortunately I don't have access to a Windows machine, to can't promise support on Windows. Some users have had issues getting the docker image to run: if this happens to you, it should be possible to run Open Topo Data outside of docker, provided all the dependencies in requirements.txt and Dockerfile are installed.