ArcGIS 9.3 矢量数据分析工具使用说明书

Exercise 2: Working with Vector Data in ArcGIS 9.3
Step1: Start ArcMap with a new project. Add the following data layers located in c:\REM402\idaho_utm
Data Layer Description Source Scale Boundary Idaho boundary Inside Idaho
County Counties of Idaho Inside Idaho Road_100 Highways, roads and trails USGS 1:100,000 Stream_100 Streams USGS 1:100,000 idstwrd_utm Idaho ownership GAP data 1:100,000
We will use this base data to create a GIS dataset for the Craig Mountain Wildlife
Management Area located south of Lewiston, Idaho north of the confluence of the Snake and Salmon River.
Step 2: Add the Craig Mountain boundary to ArcMap. The boundary is a shape file located in the folder c:\REM402\Craig and named craig_bnd.shp
Clip
CLIP operation: Clip one layer based on another. The CLIP operation works like a
cookie-cutter. In this exercise we will clip streams, roads and ownership to the boundary of Craig Mountain.
Step 5: Use the Clip function to clip out streams (stream_100) and then ownership (idstwrd_utm) using the Craig Mountain boundary as the clip-layer.
After you have created the subset layers of roads, streams and ownership you can remove the statewide layers from the project by right-clicking on the layer and select remove. This removes the layer from the map project, however the data file still resides in c:\REM402\Idaho_utm on your computer.
Remember to save your work periodically!
Xtools extension
Xtools is a ‘third party’ extension (not created by ESRI) that can be downloaded at no cost from ESRI(/). Xtools is already on the GIS lab computers. Search on Xtools.
After the search is done, select to download Xtools Pro 3.0.
The downloaded file is compressed (zip) and must be uncompressed using the WinZip software. You can download WinZip for free from (search on WinZip) if you don’t have this software on your computer.
Install the Xtools Pro 3.0 software on your computer.
Create a summary table in ArcMap
Step 6: Open the theme table for the ownership layer for the Craig Mountain ownership layer. Make sure the area has been updated according to above instructions. The attribute OWNERNAME designates the land-managing entity (BLM, Forest Service, Private etc.) for each one of the over 200 polygons in the table. In the next step you will create a summary table that summarizes the area for each owner category.
Intersect
The INTERSECT operation is an overlay analysis between two vector data layers that creates an output data layer that contains the spatial and attribute information from both the input layers.
For example, if we intersect the Craig Mountain ownership layer with the Idaho counties we create a layer that contains both the information about ownership and what county each polygon belongs to.
Step 8: Use the ArcToolbox Analysis Tools to intersect the Craig Mountain ownership layer with the Idaho counties. Select Analysis Tools – Overlay – Intersect in ArcToolbox.
Step 10: Notice how the arcs from the county layer have been incorporated into the ownership layer. The polygons along the county boundary have been split in two – one that resides in Lewis County and one that resides in Nez Perce County.
The attribute table for the resulting theme contains information about both ownership and what county each polygon resides in.
Proximity Analysis
In natural resource applications proximity analysis (buffering) is often used to estimate area of riparian zone and habitat along streams. Roads, shorelines and legal boundaries are other features commonly buffered.
Point locations can also be buffered. In analyses of wildlife habitat it is often of interest to determine what habitats are within a certain distance of animal observation locations such as nests, foraging areas, etc.
In the following exercise you will buffer the streams on Craig Mountain and calculate how much area is within 30 m of a stream.
Step 12: Select Analysis Tools – Proximity – Buffer in ArcToolbox. Buffer the streams on Craig Mountain with a 30 m buffer (make sure to buffer the streams on Craig Mountain rather than all of the streams in Idaho!!).
Step 13: Use Xtools to update the area for the stream buffer. How much area on Craig Mountain is within 30 m of a stream?
Save the project. You will be using this project in the next lesson!
Deliverables Lesson 2
1. A map displaying the land owner categories on Craig Mountain. Also include roads and streams on the map. Include a legible legend, scalebar, northarrow etc.
2. The summary table of area in different land ownership created as part of this lab.
3. An estimate for how much area is within 30 meters of a stream on Craig Mountain. Please compile all deliverables in ONE document before submitting in Blackboard!。