survgr

A django project for transforming coordinates between the various Coordinate Systems used in Greece. You can try the app at https://www.survo.gr

It is (will be for the time being) a website / web api for transforming earth point coordinates and other geometries between:

• GGRS87 / TM87 (EPSG:2100 and EPSG:4121)
• Old Greek Datum (EPSG:4815)
• Various HATT projections with respect to the Old Greek Datum using the published coefficients by OKXE
• TM3 zone projections with respect to the Old Greek Datum
• ED50 / UTM (EPSG:4230, EPSG:23034, EPSG:23035)
• WGS84 (EPSG:4326)
• The new HTRS07 / TM07 using the accurate transformation published by Hepos

Prerequisites:

• python 3.8 and virtualenv setup for backend
• nodejs and npm for frontend

To install and run the project locally:

• Make a fresh python 3 virtual environment
• pip install -r requirements.txt for the back-end dependencies
• Add a simple text file named ".env" with some environment values for
  • DJANGO_SECRET_KEY=addasecretkeyhere
  • DATABASE_URL=sqlite:///survgr.db
  • SURVGR_DEBUG=True
• python manage.py migrate to create an sqlite db with some initial data
• Run python manage.py test for testing
• Prepare the front-end:
  • cd frontend
  • npm install to install front-end dependencies locally
  • npm run build to build the front-end files
  • or npm run watch to run the front-end server
• Run python manage.py collectstatic
• Run python manage.py runserver to run the back-end server