topic Re: Creating new shp file by drawing polygons in ArcGIS Pro Questions

Creating new shp file by drawing polygons

CurtisShmigelsky1 — Thu, 28 Jan 2016 22:40:41 GMT

Hello again with another newbie question

I have the point shp file as shown in the attachment, but I need it to a polygon shp file with each polygon having the area calculated. I was thinking of drawing the polygons in another layer and exporting that layer as a shp file. Is that the proper approach to this or is there another way? If so, how can you create a new empty layer and draw the polygons on it? ( I tried add data under the map tab but I am not seeing how to create a new empty layer and drawing the polygons on it)

Thanks again for the help

Re: Creating new shp file by drawing polygons

DarrenWiens2 — Thu, 28 Jan 2016 22:46:47 GMT

To create a new, blank feature class: Open the Catalog. Right-click the workspace (folder or gdb) in which you want to make your new feature class. Choose New -> Shapefile (or Feature Class).

If you use a GDB feature class, it will create two new auto-populated fields, one for perimeter and one for area, so you don't have to calculate those.

I'm unclear whether you want to use your existing point geometry as polygon vertices, or start fresh.

Re: Creating new shp file by drawing polygons

CurtisShmigelsky1 — Thu, 28 Jan 2016 23:17:01 GMT

If I could use the existing point geometry, that would be best. This is for ArcGIS Pro 1.1.1

Re: Creating new shp file by drawing polygons

XanderBakker — Thu, 28 Jan 2016 23:39:45 GMT

You posted this question in the ArcGIS Pro Space so I assume you are using ArcGIS Pro. When you have a project in ArcGIS Pro, you will also have a File Geodatabase to store your project data. You can right click on the File Geodatabase and select New, Featureclass:

... but this will create a featureclass in a File Geodatabase and not the Shapefile format you are mentioning. To create a Shapefile you will have to execute the Create Feature Class—Data Management toolbox | ArcGIS for Desktop tool.

If you select a Folder as the Feature Class Location you will create a shapefile.

You will probably select "Current Map [Map]" as coordinate system or the coordinate system of your points for this featureclass.

Once you have created the featureclass and it is added to your map, you can start digitizing.

See: Open a map and start editing—ArcGIS Pro | ArcGIS for Desktop and Create polygon features—ArcGIS Pro | ArcGIS for Desktop for instructions.

The alternative is to convert the existing points to a polygon. For this you use Points To Line—Data Management toolbox | ArcGIS for Desktop followed by Feature To Polygon—Data Management toolbox | ArcGIS for Desktop

Re: Creating new shp file by drawing polygons

DarrenWiens2 — Thu, 28 Jan 2016 23:44:37 GMT

Ah, my instructions are for ArcGIS Desktop. Sorry, I didn't register that your post had been filed in the correct place.

Re: Creating new shp file by drawing polygons

DanPatterson_Retired — Thu, 28 Jan 2016 23:48:51 GMT

Other information is also included here

ArcGIS Pro ... useful transitioning links and images

it includes how to create shapefiles etc.

Re: Creating new shp file by drawing polygons

CurtisShmigelsky1 — Fri, 29 Jan 2016 00:07:11 GMT

Yeah I believe I am 95% there. I was able to create the new feature, the polygon, the export that polygon out as shp files (Right click data->export feature)

It look likes the shape_area record is in square feet? (based off the default). I was hoping to have it record in hectares. I changed the default unit measurement to hectares in the options under project -> units. I also checked the layer properties but did not see anything. What would be the way to set the default units?

Thanks for the awesome support by the way everyone.

Re: Creating new shp file by drawing polygons

CurtisShmigelsky1 — Fri, 29 Jan 2016 22:44:27 GMT

Hi. Just a quick followup regarding the units the shape_area is recorded in. Where would I change the unit used for the measurement (I tried the project settings but had no luck

Thanks again

Re: Creating new shp file by drawing polygons

DanPatterson_Retired — Fri, 29 Jan 2016 23:03:23 GMT

the units are in the units of the data, if in meters, m^2 would be area... ft to ft^2. There are a variety of ways to do that. Preferably, one should calculate a new field, appropriately labelled, to reflect units in a different measure.

Fundamentals of field calculations—Help | ArcGIS for Desktop

Re: Creating new shp file by drawing polygons

CurtisShmigelsky1 — Mon, 01 Feb 2016 19:58:32 GMT

OK make sense.

Would my assumption for drawing a polygon units be measured square feet or how would I tell what unit its measured in? (The shape_area field)?

Thanks as always

Re: Creating new shp file by drawing polygons

DarrenWiens2 — Mon, 01 Feb 2016 20:11:17 GMT

I know you're working Pro, but here's how you would find the unit in Desktop. I assume there's something similar in Pro.