Digitizing farm layout features

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{{#customtitle:Digitizing, importing, or modifying land features|Digitizing land features}}

This exercise is included in the tutorial: Setting up your farm or land project
In this learning guide you will learn how to edit or add land features to your project. We will go through different examples for creating, editing, or importing fields, and adding a stream waterway. 

Please keep in mind that the steps when digitizing a line, point or polygon feature are always the same:

  1. Select the layer that you want to make active, in the References panel.
  2. Digitize the field using Drawing tools .



Import fields from an existing shape file

GeoAgro can import features in shape or .txt formats. Let's see how you would import fields available in shape format:

  1. Start a project in the State of Iowa following instructions from this learning guide: Create a Project and add data
  2. Download this sample (.shp) shape file , which is compressed in a .zip file, and save it to your local disk. After download, uncompress the .zip file.
  3. Use the Import layer option to import the shape file
    GIS gis Edit 07a 01.jpg

  4. In the Import window, assign the following values, and then click on "Accept":
    Group: Farm Layout
    Structure: Fields NRCS


    LG DigiFea 08.jpg

    When choosing the data Structure that will be associated to your layer, you may either:
    * use the 'import structure' option, to create a new structure, based on the file that you are importing
    * match to an available data structure in GeoAgro GIS. In the example above, it was matched to data structure 'Fields_NRCS'.
    Please note that GeoAgro GIS will automatically match the closest available data structure for the layer that you are importing.


  5. Click on the 'NAIP Imagery' Layer to turn on Imagery from the USDA National Aerial Imagery Program (NAIP). If it doesn't refresh, use the Pan tool Image:GIS_gis_Navi_02_01.jpg to move the view a bit, and refresh the imagery.

  6. You should now see the land units with background imagery:
    Digitizing farm layout 03.jpg

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Modify existing fields

For this exercise, we are going to use the previously imported Land Unit, and divide it in two.

  1. Double click on the "Sample Field" layer to make it the active layer, and at the same time zoom into your Fields area 
  2. Select the Fields by using the rectangle Selection tool
    Click here to see it full size


  3. Click on the Edit Toolbar Image:GIS_gis_Edit_05_01.jpg and go to the Divide Objects (Line) tool Image:GIS_gis_Edit_05k_01.jpg
  4. Click outside the field and then draw a line to divide the field. To finalize, continue the line outside the field, and double click.
    Image:LG_DigFea_03.jpg

  5. Your field is now divided in two
    Image:LG_DigFea_04.jpg

Note Note: When you would like to modify an existing feature, the sequence is always the same: click on the layer to make it active, select the feature, and select one of the drawing tools to modify it


Enter attributes for your fields

This example is based on the previous exercise (# 3), but is applicable to any method you choose to create fields or other features:

  1. Click on the 'Sample_Field' layer to make it active
  2. Select the two previously created Fields by using the rectangle selection tool
  3. Go to the info tool to view/edit attributes Image:GIS_gis_Edit_06_01.jpg. Enter values: 3 in the FIELD_NAME column for both land units and a, b in the SUBFLD_NAM column for the land unit on top and bottom respectively.
    Image:LG_DigFea_05.jpg

  4. Click Save to save your entries
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Digitizing a Stream

This example is based on the previous exercise (# 3), but is applicable to any other way that you create your farm layout:

Now we are going to digitize a Stream

  1. Click on the Streams layer to make it active.
    Image:Layer_Streams.jpg

  2. Click on the 'NAIP Imagery' Layer to turn on Imagery from the USDA National Aerial Imagery Program (NAIP). If it doesn't refresh, use the Pan tool Image:GIS_gis_Navi_02_01.jpg to move the view a bit, and refresh the imagery.
  3. Click on the Edit Toolbar GIS gis Edit 05 01.jpg and go to the Add New Object tool Image:GIS_gis_Edit_05a_01.jpg
  4. Start digitizing. There are a number of features that you may use to move, delete and add nodes, as detailed in Related Articles below. Complete your Stream and double click or righ-click to end digitizing.
    Image:LG_DigFea_06.jpg

  5. Your Stream should look like this:
    Click here to see it full size

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