Module to load elevation data from a USGS GeoTiff file into a Graph database. Works by querying all relationships in the Graph, iterating over each, and looking up elevation in the GeoTiff (based on relationship lat/long GPS coordinates stored in the geom property). This module is designed to be run on Graph data loaded by the osm2graph-neo4j module.
Tested with GeoTiff files from USGS The National Map. Note: The GeoTools library used for GeoTiff parsing does not support GeoTiff compression, so make sure any GeoTiff files are uncompressed.
The .pom file is set to compile a standalone .jar file.
mvn clean install
Use the follow command to execute the module, with the .tif file and graph.db paths supplied as parameters.
java -jar target/elevationGeoTiff-0.0.1-SNAPSHOT.jar /development/workspace/USGS_13_n38w123_uncomp.tif /development/workspace/neo4j/graph.db
The Graph database is expected to have an array of Neo4j Spatial Point datatypes populated on the relationship geom property. See the schema created by the osm2graph-neo4j module for more details.
Tests can be executed with the following command:
mvn test
Special thank you to these posts/resources that helped overcome strange hurdles:
- Executable
.jarwould break when attempting to load GeoTiff - required shading rule inpom.xml- https://johnewart.net/2012/geotools-maven-and-jai-oh-my/
I wrote a blog post about the research and findings encountered as part of creating this module: https://taylor.callsen.me/parsing-geotiff-files-in-java/