Exploring Maps: Navigation Panel
From Wikiagro.com
| This exercise is included in the tutorial: Using GeoAgro GIS |
Contents |
Exercises
Where to Do the Exercises
The first step to complete the exercises in this tutorial is to set up the computer you will be working on. You may either:
- Work on your own computer: If you completed our Getting Started Course, your system and datasets are ready to go through this learning guide. You will be able to use our GeoAgro GIS trial version for 2 months. From now on, you are ready to begin with any learning guide you wish.
- Work on a virtual computer provided by GeoAgro: This does not require any previous installation. See Prepare a GGS Tutorial on a virtual computer
The following instructions apply to either method, unless otherwise specified.
Exercise 01 – Selecting and Checking Data
Selection Tools
Several GeoAgro GIS operations require that you first select of one or several objects. There are several ways of selecting an object, as you can see when expanding the selection tool.
Standing on top of Fields_Spreadable Acreage layer select the Point option and then click on field 'a':
To select two consecutive fields, go to the option Rectangle and draw a rectangle that intersects both field 'a' and 'b':
To unselect both fields click on Remove Selection:
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Data Querying Tools
Now you will select fields 'a' and 'b' with the Select by Rectangle tool 
. To do that, select a rectangle that intersects the two fields mentioned above:
Go to the Query tool. The attribute table for the objects you have selected will open.
You will next export the table in Excel format (.xls).
Click on Export and save the table as fields_adc.xls. Then click OK.
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Exercise 02 – Exploring
Positioned on the layer called Soils, double click on it: You will see that the layer automatically turns on and the map scales to suit the size of it.
Now, go to the Pan Tool.
After clicking on it, a white hand cursor will be activated. By pressing and holding the left mouse button, you will be able to navigate the map.
Zoom Tools
Go to the Navigation Panel and click on the Rectangle Zoom Tool.
Draw a rectangle around the Field 'a' to get closer view of that layer.
Go to the Navigation Panel and click on the Show Full Map tool.
Next, the maximum size of the image corresponding to the visible layers will be shown on the work window.
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Exercise 03 – Measuring
Measuring Tools
Double click on the layer called 'Tracts' under the 'Map Layout' group. Then, go to the navigation panel and expand the arrow in Measuring Tools and click on Length.
Click on the upper left corner of the field 'a' and then double click on the upper right corner of it. You will automatically see the segment defined with the measured distance. Length units can be selected right there. By default, GeoAgro GIS shows length in feets.
You will now calculate the area of the same field expressed in acres. In order to do that, go back to the navigation panel and expand the arrow in Measuring Tools and click on Surface.
By clicking on each vertex of field 'a', and double-clicking on the last vertex that closes the plot, the surface of the polygon that has been created will be shown in acres. The surface units can be selected right there.
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Exercise 04 – Presenting Information
Print Tool
In this exercise you will print a map containing the 'Fields_Spreadable Acreage', 'Tracts', 'Well', 'Stream' and 'Soils' layers. You will use the satellite named 'Orthophoto' as background. In order to do that, highlight the layers mentioned before in the Reference Panel. Then, go to the Navigation Panel and click on the Print tool.
Next, a predefined map model will open. Enter the title you want to be displayed on the page and the comments at the bottom of the map. Check the boxes for Mini Map, References, Scale, and Date. Then, locate the compass rose where you want it to be displayed, by click and drag on the box located to the left of the map.
| Note: | At this point you can send this map directly to the printer by clicking on the Print button; or you can just save an image of it by clicking on the Save button |
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