diff --git a/dem_blender.py b/dem_blender.py
deleted file mode 100644
index 9d6bcf8..0000000
--- a/dem_blender.py
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/usr/bin/env python3
-# Authors: Piero Toffanin, Stephen Mather
-# License: AGPLv3
-
-import os
-import glob
-import sys
-sys.path.insert(0, os.path.join("..", "..", os.path.dirname(__file__)))
-
-import argparse
-import multiprocessing
-import merge
-
-parser = argparse.ArgumentParser(description='Merge and blend DEMs using OpenDroneMap\'s approach.')
-parser.add_argument('input_dems',
-                type=str,
-                help='Path to input dems (.tif)')
-
-args = parser.parse_args()
-
-if not os.path.exists(args.input_dems):
-    print("%s does not exist" % args.input_dems)
-    exit(1)
-
-output_dem = os.path.join(args.input_dems, 'merged_blended_dem.tif')
-input_dem_path = os.path.join(args.input_dems, '*.tif')
-input_dems = glob.glob(input_dem_path)
-
-merge.euclidean_merge_dems(input_dems
-                    ,output_dem=output_dem
-                )
diff --git a/dem_blender/__init__.py b/dem_blender/__init__.py
new file mode 100644
index 0000000..cc4660f
--- /dev/null
+++ b/dem_blender/__init__.py
@@ -0,0 +1,11 @@
+"""DEM Blender. Seamless merging of Digital Terrain Models with overlap from different sources."""
+
+__version__ = "0.1.0"
+
+from .cli import *
+from . import dem_blender
+
+__all__ = [
+    "dem_blender",
+    "cli"
+]
diff --git a/arghelpers.py b/dem_blender/arghelpers.py
similarity index 100%
rename from arghelpers.py
rename to dem_blender/arghelpers.py
diff --git a/dem_blender/cli/__init__.py b/dem_blender/cli/__init__.py
new file mode 100644
index 0000000..c6a7b5b
--- /dev/null
+++ b/dem_blender/cli/__init__.py
@@ -0,0 +1 @@
+"""DEM blender command-line interface."""
diff --git a/dem_blender/cli/main.py b/dem_blender/cli/main.py
new file mode 100644
index 0000000..688ba07
--- /dev/null
+++ b/dem_blender/cli/main.py
@@ -0,0 +1,40 @@
+import click
+from pathlib import Path
+from dem_blender import dem_blender
+
+def print_info(ctx, param, value):
+    if not value:
+        return {}
+    click.echo(f"DEM Blender, Copyright Localdevices, OpenDroneMap.org")
+    ctx.exit()
+
+def print_license(ctx, param, value):
+    if not value:
+        return {}
+    click.echo(f"GNU Affero General Public License v3 (AGPLv3). See https://www.gnu.org/licenses/agpl-3.0.en.html")
+    ctx.exit()
+
+path_opt = click.option(
+    "-p",
+    "--path",
+    type=click.Path(exists=True, resolve_path=True, dir_okay=True, file_okay=False),
+    help="Path to directory containing terrain models",
+    # callback=validate_files_in_dir,  # TODO: write a validator that confirms that all files in folder are valid geospatial raster files
+    required=True
+)
+
+@click.command()
+@click.argument(
+    'OUTPUT',
+    type=click.Path(resolve_path=True, dir_okay=False, file_okay=True),
+    required=True
+)
+@path_opt
+def merge(
+        output: Path,
+        path: Path,
+):
+    """Single CLI command for blending terrain models."""
+    print(f"Input path: {path}")
+    print(f"Output path file: {output}")
+    raise NotImplementedError
\ No newline at end of file
diff --git a/dem_blender/dem_blender.py b/dem_blender/dem_blender.py
new file mode 100644
index 0000000..461a634
--- /dev/null
+++ b/dem_blender/dem_blender.py
@@ -0,0 +1,30 @@
+"""Main API to DEM blender."""
+import os
+import glob
+import sys
+sys.path.insert(0, os.path.join("..", "..", os.path.dirname(__file__)))
+
+import argparse
+import merge
+
+# TODO: modify to API callend from click interface
+
+######
+# parser = argparse.ArgumentParser(description='Merge and blend DEMs using OpenDroneMap\'s approach.')
+# parser.add_argument('input_dems',
+#                 type=str,
+#                 help='Path to input dems (.tif)')
+#
+# args = parser.parse_args()
+
+# if not os.path.exists(args.input_dems):
+#     print("%s does not exist" % args.input_dems)
+#     exit(1)
+
+# output_dem = os.path.join(args.input_dems, 'merged_blended_dem.tif')
+# input_dem_path = os.path.join(args.input_dems, '*.tif')
+# input_dems = glob.glob(input_dem_path)
+#
+# merge.euclidean_merge_dems(input_dems
+#                     ,output_dem=output_dem
+#                 )
diff --git a/euclid.py b/dem_blender/euclid.py
similarity index 100%
rename from euclid.py
rename to dem_blender/euclid.py
diff --git a/gdal_fillnodata.py b/dem_blender/gdal_fillnodata.py
similarity index 100%
rename from gdal_fillnodata.py
rename to dem_blender/gdal_fillnodata.py
diff --git a/log.py b/dem_blender/log.py
similarity index 100%
rename from log.py
rename to dem_blender/log.py
diff --git a/merge.py b/dem_blender/merge.py
similarity index 100%
rename from merge.py
rename to dem_blender/merge.py
diff --git a/odm_system.py b/dem_blender/odm_system.py
similarity index 100%
rename from odm_system.py
rename to dem_blender/odm_system.py
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..792015d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,82 @@
+[build-system]
+requires = ["flit_core >=3.4.0,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "dem_blender"
+authors = [
+  { name = "Stephen Mather", email = "stephen.mather@opendronemap.org" },
+]
+packages = [
+    { include = "dem_blender" }
+]
+
+dependencies = [
+    "click",
+    "numpy",
+    "scipy",
+    "rasterio>=1.3.11",
+    "python-dateutil",
+    "joblib"
+]
+
+requires-python =">=3.9"
+readme = "README.md"
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "Topic :: Scientific/Engineering :: Hydrology",
+    "Topic :: Scientific/Engineering :: Image Processing",
+    "License :: OSI Approved :: GNU Affero General Public License v3",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11"
+]
+dynamic = ['version', 'description']
+
+[project.optional-dependencies]
+extra = [
+    "matplotlib",
+    "notebook"
+]
+test = [
+    "pytest",
+    "pytest-cov",
+]
+
+full = ["dem_blender[extra,test]"]
+
+[project.scripts]
+dem_blender = "dem_blender.cli.main:merge"
+
+[project.urls]
+Source = "https://github.com/localdevices/dem_blender"
+
+[tool.flit.sdist]
+include = ["dem_blender"]
+
+[tool.flit.module]
+name = "dem_blender"
+
+[tool.pytest.ini_options]
+addopts = "--ff "
+testpaths = ["tests"]
+filterwarnings = [
+]
+
+# [tool.ruff]
+# line-length = 120
+# target-version = "py39"
+# exclude = ["docs"]
+#
+# [tool.ruff.lint]
+# # enable pydocstyle (E), pyflake (F) and isort (I), pytest-style (PT), bugbear (B)
+# select = ["E", "F", "I", "PT", "D", "B", "ICN", "TID"]
+# ignore = ["D211", "D213", "D206", "E741", "D105", "D203", "E712", "B904"]  # "E501" line length
+#
+# [tool.ruff.lint.per-file-ignores]
+# "tests/**" = ["D100", "D101", "D102", "D103", "D104"]
+# "pivnumba/__init__.py" = ["E402", "F401", "F403"]
+# "tests/conftest.py" = ["E402"]
diff --git a/requirements.txt b/requirements.txt
index 0034c7b..b57db24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
-dateutil
 numpy
 scipy
 rasterio>=1.3.11
+python-dateutil
 joblib
 # osgeo
 # gdal