Wednesday, September 21, 2011

Lab 4

Part One

Beginning in ArcCatalog, I changed the projection of all three datasets to North America Albers Equal Area Conic. I then dragged the data into ArcMap. I did not have to do any further steps to align them once they were in ArcMap. Although the final projection was not an exact replica to the original, they were displayed in a similar fashion.

Part Two

1. The vector datasets shown are caves (points), marble (polygon), and streams (line).

2. The three datasets are saved to shapefile format.

3. The six file extensions are- .dbf, .prj, .shp, .sbn, .shx, .sbx.

4. Datums are given in the .prj files.

5. File types:
.shp- A shapefile stores nontopological geography and attribute information for
spatial features in a data set. Consists of a main file, an index file, and a dBASE
file.
.shx- Shape index format. Positional index of feature geometry to allow seeking
forward and backward easily.
.sbn- Spatial index of features.
.prj- Projection format. Specifies geographic coordinate systems of geometric data
in .shp file.
.dbf- Suffix for dBASE table. Under shapefile. Stores attributes for each shape.

6. The .dbf file extension contains attribute information.

7. When opened, the geodatabase shows a list of feature and raster data. The feature classes
present are:
Points (Cities, Caves, Chihuahua, Crystal, Franklin, Mines, Monarch, Sinks, Swallets, Timber_Gap, White_ Chief)
Lines (Faults, Folds, Lineaments, MIKI_streams, Streams, Highways, Roads, Trails)
Polygons (KingsCanyonTractsNP, KingsNP, SequoiaKingsNP, SequoiaNP, SequoiaTractsNP, Wilderness, Marble, Catchments, Lakes, Vegeation)

8. Microsoft Access is the program prompted to open the geodatabase.

9. Using ArcCatalog, when the "+" button to the left of the raster layer is clicked, three sets of raster data is displayed. Band_1, Band_2, and Band_3.

10. In Windows Explorer, three files are seen with the extensions are AUX, SID, and SDW.

11. AUX- Auxiliary file- accompanies the raster in the same location and stores any auxiliary information that cannot be stored in the raster file itself.
SID- (MrSID)- Multiresolution seamless image database. This is a compressor viewer and file format for large raster images allowing maximum image quality.
SDW- These are text document files created in Star Office Writer.

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