diff --git a/environment.yml b/environment.yml
index e8c29df3b..1047036c5 100644
--- a/environment.yml
+++ b/environment.yml
@@ -25,3 +25,4 @@ dependencies:
     - pytorch-sphinx-theme
     - radiant-mlhub>=0.2.1
     - rarfile
+    - rtree>=0.5.0
diff --git a/requirements.txt b/requirements.txt
index edfa36372..570e5f5b9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ pytorch-sphinx-theme
 radiant-mlhub>=0.2.1
 rarfile
 rasterio
+rtree>=0.5.0
 setuptools>=42
 shapely>=1.2.9
 sphinx
diff --git a/setup.cfg b/setup.cfg
index 2939bca52..e4ec7f5ad 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,6 +29,7 @@ install_requires =
     numpy
     pillow
     rasterio
+    rtree>=0.5.0
     shapely>=1.2.9
     torch>=1.7
     torchvision!=0.10.0
diff --git a/spack.yaml b/spack.yaml
index 7999b96cf..5c065edcd 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -16,6 +16,7 @@ spack:
   - "py-radiant-mlhub@0.2.1:"
   - py-rarfile
   - py-rasterio
+  - "py-rtree@0.5.0:"
   - "py-setuptools@42:"
   - "py-shapely@1.2.9:"
   - py-sphinx