Create a 5km square fishnet in ArcMap

Question

Hi,

I have to create a grid that cover my entire study area and where each cell will have a surface equal to 5km square. Not sure what are the values should I setup in the cell size width and height?

This is what I tried:

If 1 degre = 111km, so 1km is 0.009 degre and then a square with a surface of 5km square would be a square of 2.236 x 2.236 km, so converted in degre: 2.236 x 0.009= 0.0201?

When creating that fishnet with 0.0201 of cell height and width, the surface of each cell is a bit less than 5km square...Sure I missed something!

Thanks

Thibaut_78 · Answer

Thanks so much! really appreciated

JayantaPoddar · Answer

1. Ensure you define a field with unique values for each cell of the Fishnet grid.

2. You could use Intersect (Analysis) between the Fishnet grid and the Tracklines. JOIN_ATTRIBUTES = ALL. Output will be a Polyline feature class with attributes of both the layers.

3. To the above output polyline layer, use Dissolve (Data Management) , keeping the Unique ID field of the Grid as the Dissolve Field parameter.

4. Use Join Field (Data Management).

Input Data: Fishnet_Grid

Input Field: Unique_ID

Join_Table: Tracklines_Dissolved

Join_Field: Unique_ID

Field(s): SHAPE_LENGTH

5. Optionally, you could add a new FLOAT/DOUBLE field in the attribute table of the Grid, and convert the Shape_Length (derived from Tracklines_Dissolved) from Meters to Kilometers using Field Calculator.

Thibaut_78 · Answer

Thank you very much. It works very well.

But now that I created a grid, I uploaded my GPS tracklines and I want to calculate the number of km in each cell. How to do that?