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CHAPTER 2 : COORDINATE SYSTEMS

TASK 1 (Project a Shapefile from a Geographic to a Projected Coordinate System)

For Task 1, we will first define idll.shp by selecting a predefined geographic coordinate system and then project the shapefile onto the Idaho Traverse Mercator coordinate system (IDTM). A custom coordinate system, IDTM has the following parameters value.

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Before projecting the shape file

XY Coordinate systems showed as unknown in Shapefile Properties dialog

Projection : Traverse MercatorDatum : NAD83Units : MeterParameters :

Scale factor : 0.9996Central meridian : -114.0Ref. Latitude : 42.0False easting : 2,500,000False northing : 1,200,000

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After project the shape file

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Shape file properties showed the shapefile has been projected from Geographic to a Projected Coordinate systems.

idll.shp to the IDTM coordinate system

Parameter values entered in Projection dialog

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Question 1

Summarize in your own words the steps you have followed to complete Task 1.

idll.shp, a shapefile measured in geographic coordinate has an unknown coordinate system before the parameter values is entered. idll.shp has successfully projected to idtm.shp. To project a shapefile from geographic to projected coordinate system

TASK 2 (Import a Coordinate System)

In Task 2, we will complete the projection of stationsll.shp by importing the projection information on idll.shp from Task 1

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Stationsll.shp coordinate systems is unknown

idll.shp

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After import the idll.shp as a Spatial Reference

stationstm.shp is now projected onto the same (IDTM) coordinate system as idtm.shp

Question 2

Describe in your own words what you have done in step 1.

For this step, what have I done was to import the coordinate system from idll.shp that have been done in task 1 to the stationsll.shp. It is easier because we do not need to repeat the step like task 1.

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Stationsll.shp coordinate systems is GCS_North_America_1927

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TASK 3 (Project a Shapefile by Using a Predefined Coordinate System)

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2) Select North America Datum 1983 projection

Add data (snow.txt)

Set up the spatial reference coordinate systems

Name it as Task 3&4

1) Click Edit button

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Finally, change the projection to NAD 1983 UTM Zone11N.prj.

Question 3

You did not have to ask for a geographic transformation in Step 2. Why?

Because we are using predefined coordinate system.This is because if we click on the properties of snow.txt event, it already has longitude in X field and latitude in the Y field.

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snow.txt Events is added to ArcMap

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TASK 4 (Convert from One Coordinate System to Another)

Change Task 3&4 coordinate systems (from GCS_NAD_1983 to NAD 1983 UTM Zone 11N)

After change Task 3&4 coordinate system (to NAD 1983 UTM Zone 11N)

NAD 1983 UTM Zone 11N

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Add and project idtm.shp to the UTM coordinate systems

idtm.shp and snow.txt Events data preview

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Question 4

Can you use Import instead of Select in step 3? If yes, how?

Yes.

Double click on the Projection Tool – select idtm for the feature class – specify idutm as output feature class – click select in the Spatial Reference System – double click on Projected Coordinate System, UTM, NAD 1983, and NAD 1983 ZONE 11N.prj – click OK.

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