Working with Survey Data in ArcGIS CVEN 2012 – Geomatics University of Colorado – Boulder April 2006 Alyssa McCluskey

Topics Covered Benefits of integrating survey data and GIS data Workflow for integrating survey and GIS data Tools for loading survey data into a geodatabase. Managing survey data in ArcCatalog™ Computing and adjusting survey data in ArcMap™ Editing geodatabase features.

Background Assume you have used a TPS instrument to perform a survey You have downloaded the data from the instrument to your computer You now want the ability to use the data in your GIS

ArcCatalog – Survey Analyst Extension

Creating a Survey Dataset

Making a Feature Survey Aware Survey-aware features can be linked to survey points without directly changing their position. This means you "track" the locations of survey-aware features as they are edited through the standard methods. They are linked to the survey points, so you can ultimately update their geometry to the survey point locations. Non-survey-aware features can also be edited by digitizing so they snap to survey points; however, these features are not "aware" of the underlying survey points to which they are snapped.

Creating Survey Project

Import Raw Data into Survey Project Survey data is data you obtained from the field with a TPS

Import Survey Data This is your raw data from the field

Import Survey Data You should know this from your survey

Import Survey Data You should know this from your survey

Import Survey Data

Preview Survey Data Points are survey points Lines represent measurements

Editor and Survey Editor

Bring Survey Project into ArcMap

Symbology

Create Sub-layer Want to separate points with known and unknown coordinates

Create Sub-layer

Points with Unknown Coordinates

Points with Known Coordinates

Control Points Provisional Point Compute Traverse

Start Editing

Set Snapping

Set Snapping Tolerance

TPS Traverse Tool

TPS Traverse Tool - General

TPS Traverse Tool - Setup Contains the instrument setup name. (The Fixed field is checked if this is the traverse start point.) Shows other properties for that setup point Shows the start point’s instrument location Info about the TPS instrument

Series of Measurements

TPS Traverse Tool - Setup

Click on each of your measurements

TPS Traverse Tool - Setup

TPS Traverse Tool - Measurement Information recorded by the survey instrument during the survey. You imported this information In this tab you can choose the traverse setup points to review the measurements that were made from them, and set or review measurement orientation information.

TPS Traverse Tool - Measurement Different traverse computation methods The Compass rule, also known as the Bowditch rule, distributes the closure error in the Northings and Eastings in proportion to the distance along all the courses, from the first point to each of the unadjusted coordinate locations. The Transit rule assumes distances have no measurement error and distributes the error only through the directions and angles. The Crandall method distributes the error in the distances only, assuming directions and angles have no measurement error.

TPS Traverse Tool - Compute

Now we have computed points, but still need buildings

TPS Traverse Tool – Compute Again

TPS Traverse Tool - Compute Now we have computed the buildings too. Notice that the buildings and point don’t exactly match. Establish a link between survey and building pts, move building and snap it to surveyed corner.

Fixing features to survey points

Use LINK tool Click on survey point, then feature corner

Fixing features to survey points Red Diamonds indicate Linkage to survey points

Fixing features to survey points Depends on the number of links you establish

Fixing features to survey points

Digitizing with Survey Data when you digitize the new GIS feature it will be linked to the survey points

Digitizing with Survey Data Click on survey points

Digitizing with Survey Data

Completing Lab 3 Skip the video Adjust the corners of the 2 remaining middle buildings, create a map of the area with 2 additional data views of the corrected buildings or print certificate of course completion

Saving/Printing Certificate

Save as pdf and to me or print and turn in.