lecture 8 Flashcards
1
Q
downloading background images for gps assistance
A
- capture and download images
- configure image for pathfinder office
-upload image to terrasync - manage images in terrasync
2
Q
background images are used to
A
locate ground control object
3
Q
aerial images are used to
A
identify nearby environments when doing gps field work
help estimate error and accuracy
4
Q
where to find background images
A
- vector datasets available from govt sites
- state sites have regional high res aerial photo images
- USGS data
- online map server
5
Q
how to configure a background image for pathfinder
A
- upload the image from a site or a source to arcmap
- zoom into the area you want to analyze, such as UNC campus
- set the data frame projection… should set it to WGS84 in class
- export your map as an image . tiff and a resolution, and ‘write world file’
- load the background image into pathfinder and confirm projection
- Utility -> Transfer : will upload the image to your Trimble GPS receiver
- in terrasync, you can turn on the background option to load the image
6
Q
what is a data dictionary
A
the entry of attribute information into a GIS using a ‘dictionary’ of assigned values/categories saved to your receiver’s memory
7
Q
data dictionary hierarchy
A
Feature - point, line, polygon
– Attribute - bench, trail, shelter, parking lot
– Value - brown bench, red bench, ugly bench, bonita bench
8
Q
designing a data dictionary
A
- define your targets based on your fieldwork survey goals
- for each type of target, define the characteristics you want to survey
- for each characteristic, define how you would describe it
- set a unique symbol for each attribute
9
Q
default dictionary settings
A
logging interval, minimum positions, accuracy
10
Q
setting an attribute type
A
- select the value as type: numeric, text, time, etc
