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02 August 2009
27 July 2009
Unsupervised Classification
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Here is a reclassified image of Pensacola, FL. Most areas were easy to reclassify including sand, forests, and water. The areas that were tough to reclassify and combine were the residential, high density urban areas, and grass. Without additional data on land use it is difficult to clearly classify this image. Grass areas are difficult as well because you cannot clearly see them on the original image. I think I completed this to the best of my ability with the given data.
21 July 2009
Usefulness or pitfalls of image rectification
Image rectification is very useful for the various photos, scanned drawings, and the many other images available today with no spatial reference. In my job, I deal with this issue everyday. Someone will walk into my office with a picture, or old hard copy drawing and want me to incorporate other accurate GIS data on top of the image. Being able to rectify these images make these images useful again. If they were nothing but a picture, most of them would just end up stuffed in a drawer. Today we can rectify these old images for use not only in GIS but for historical preservation.
Pitfalls that come into play include poor resolution of images that make it hard for the user to be able to select distinguishable reference points. Also, images may be too warped to be able to rectify properly for use with other data.
Pitfalls that come into play include poor resolution of images that make it hard for the user to be able to select distinguishable reference points. Also, images may be too warped to be able to rectify properly for use with other data.
14 July 2009
Fort-Worth Thermal Image
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Roads - Bright color.Pavement heats up quicker in the morning and retains heat over night.
Natural and man-made vegetation - medium brightness. Barren ground will hold more heat over night than grassy areas. Lighter ground in the image will appear warmer than darker greener areas.
Sidewalks and patios - bright color. Concrete walkways and patios will hold more heat overnight as well and will heat up quicker in the morning sunlight.
Storage sheds in back yards - dark color. Sheds have probably not been hit by the sunlight yet as the houses are blocking them.
Automobiles – medium dark to full dark. If the cars have been run recently then the fronts will be whiter and if they haven’t they will be darker. Also, cars will appear darker if they haven’t been in the sun yet.
Bright spots on many of the roof tops – roof vents that are metal will attract sun quicker and show hotter.
08 July 2009
Multispectral and Panchromatic image of Marco Island Analysis
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The second image is a panchromatic image which displays black and white colors, whith bands: Red=1, Green=1, and Blue=1. This image is hard to derive anything from. The only thing visible is vegetation, water, and land areas. This image would only be usable as a background map since no spectral data could be gained.
29 June 2009
Aerial Photograph
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2. What problems might you infer or identify in using this type of photograph?
- In this photo, true colors cannot be seen so it is not an easy photo to study. Also, even though types of land are contrasted differently (forested areas, bare land, etc...) you cannot distinguish the specific types because in the photo everything has a red contrast. For example: On the golf course you can distinguish fairways and rough areas, but it is difficult to make out greens, tee boxes, bunkers, etc... If this was in true color then you could make out the specific details. Lastly, the scale of this photo may affect the users ability to perform on-screen digitizing. The features may not be clear enough to accurately map.
28 April 2009
Michigan Wind Farm Location
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I chose a location between Holland and Muskegon, just west of Grand Rapids, MI. This location has mean wind speeds between 7.5 and 8.8mph on average. It would be close to existing electrical transmission lines that power southern Michigan. Being positioned along the coast would allow the farm to work quietly without disturbing nearby cities, but provide more local jobs to the area.
26 April 2009
Isohyet Map
19 April 2009
Immigration Flow Map
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