# lab3
## Review
- Data has different uncertainty due to devices and environmental factors.
- By outlier detection, we can exclude (at least part of) the blunders.
- Steps of outlier detection?
- The uncertainty of a value derived from measurements can be computed by error propagation.
- Step of error propagation?

## ArcGIS pro
- Raster (.tif, .tiff, .geotiff)
- Grid data
- 2D/ 3D Array
- Vector (.shp): Contain geometry and attribute table
- Point
- Line: start point and end point
- Polygon: Every corners in a polygon
- Feature: Almost same as vector but it is saved as another format.
- Projection: Project 3D world to 2D map
- Is it possible to preserve every feature in the process?