Information about how to create a spreadsheet with lat/long data is coming soon!
<!– This can be done to create blank rectilinear grids. If the grid is not rectilinear:

• if it has a paper map index: scan and trace
• if it does not have a paper map index, but it does have lat long at the corners: create spreadsheet with lat and long columns
• if it does not have a paper index nor a lat long at the corners, then use geojson.io or QGIS to create the index manually –>

Creating a spreadsheet with latitude and longitude columns

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