Download GRS-10306 Transformations Part 1 (version 20091116)

GRS-10306 Transformations Part 1
Adding collected data to a data frame.
(version 2010-11-15)
During the exercise WYSIWYG you collected data with a Garmin handheld GPS receiver. Those data
(marked waypoints and tracks) are imported into a PC and converted to usable data.
In the course schedule you will find a link (GarminP2A) to download the data of all groups (X stands
for the period). The names of the Garmin receivers are used to separate all the files. If you cannot
remember the name of the receiver you’ve used, just get the data of another group. Type instead of
## the number of the receiver you want to use. For each receiver you will find 5 files:
 Ae##.gpx :
the original data from the receiver
 Ae##.txt :
all original data from the receiver as notepad file
 Ae##points.dbf :
only the marked waypoints of your survey
 Ae##Track.csv :
the complete registered track of your survey and
 Ae##Trackpoints.dbf : the file with all the separate TrackPoints of the complete track
If you open (edit) Ae##.txt you will see how the data is collected as text. Both other formats (dbf and
csv) are necessary for importing data into ArcGIS.
INSTRUCTIONS (Displaying a table with coordinate data as points in ArcMap)
1. Choose in the menu bar Tools and then Add XY Data… .
2. In the next window you select the table where you want to add coordinates in the field
“Choose a table from the map or browse for another table”
3. In the same window you will see the coordinate system. In case the coordinate system is
unknown, use the Edit… button to add the coordinate system and set it to
Rijksdriehoekstelsel.
4. Press the OK button
5. A set of points (Ae## …. events) will be displayed, but these points are not shape files yet.
Right click the newly created layer, go to Data Export Data and store your new shapefile
with a proper name in your workspace directory and add the shapefile as a layer to your
project.
1.
Create a new ArcMap document with the name GARMIN.mxd and display your marked waypoints
(Ae##points.dbf) and your track points (Ae##trackpoints.dbf).
a.
What is your opinion on the spatial accuracy of your marked waypoints and your track points?
INSTRUCTIONS (Adding a track as a line object)
1. Go to ArcToolbox. Select the tool: 3D Analyst ToolsConversionFrom File
ASCII 3D to Feature Class
2. Select your .csv file as input
3. As Input file format select GENERATE
4. Save your output feature class with a proper name (e.g. TracksAe##) in your workspace
directory
5. Set your output feature class type to POLYLINE
6. Set the coordinate system to Rijksdriehoekstelsel
7. Leave all the other settings to their default and press OK
2.
Add the track (Ae##Track.csv) as a line object.
a.
What is your opinion on the data quality of the track?
b.
Determine the length of your track in km (HINT: See Module 2 page 6 of the practical manual
on how to calculate geometry, but now calculate the “length” instead of “area”).
Now you can perform some analyses using your GPS marked way points and other data.
3.
Determine the average distance from the closest 10 marked waypoints to the pond North of the Lumen
building. Don’t include (potential) points in the pond.
(HINT: First export the pond to a new dataset (e.g. pond.shp) and also export the points that do not
fall within the pond to a new dataset: e.g. pnts_out_pond.shp).
4.
Select at least 10 of the most important objects of your green maintenance system ( use the marked
waypoints) and make a final map/layout where the meaning of these points are displayed in the
legend.