# Populating sample units inside polygon using ArcMap

A big part of my job currently is drawing out sample units that are roughly 2500 square ft for inspection and are all located within a polygon for the Section. I made a very quick example below.

The way this has traditionally been done is manually creating all of these sample boxes by using parallel lines and measuring out the length or width of the sample and then using some basic math to make it add up to somewhere around 2500 square ft.

I am not the most knowledgeable about ArcMap and GIS, but I know the basics and feel like this should definitely be possible to do using some sort of tool available in ArcMap. I have been trying to use the "Create Fishnet" tool to some success, but I think I need to mess around further with the settings.

Most of these Sections are outlines of parking lots and roads so I am dealing with pretty regular geometry for the most part, but some instances like buildings being cut out of the map and such make it difficult to just say "Make two columns with squares that are 50ftx50ft."

What are "Cell Height" and "Cell Width" fields when creating the fishnet features?

Is there a way I can make this into feet or even meters?

I don't know what it is basing 1 cell unit from. If I can't find a way to fully populate the polygon, I would still save a lot of time by populating much of the space with this tool with 50'x50' squares.

• From the sounds of it you have geographical data if you're having difficulty creating 50' or 15 metre cells.. the cell width and height of the fishnet tool is the size of the box you're trying to create in the fishnet which will be degrees in a geographic CRS. A combination of create fishnet and generalize polygon resources.arcgis.com/en/help/main/10.2/index.html#/… to merge small polys should get you fairly close but first you will need to create your fishnet in a projected coordinate system then clip the fishnet with your geometry (red polygon). – Michael Stimson Nov 25 '19 at 0:30