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I need imagery for a large remote area in British Columbia. The Esri world imagery basemap and the Bing imagery basemap have a few areas that are of poor resolution and there are several different years of imagery collection so the basemap isn't the most professional looking. This project is on a limited budget so purchasing high res satellite imagery isn't an option. I am looking for free or very inexpensive imagery or other basemap options.
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07-05-2018
02:22 PM
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I have a high resolution ecw raster that has a white border around the imagery. The pixel values for the white border are not 1 RBG value so I am not able to set a No data value and apply no color. I have tried clipping but it has not worked.
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11-18-2017
09:17 PM
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Thanks Melita. Projecting the data in UTM 9 doesn't work as the data is a local projection. When I project it in UTM 9 it shows up in the ocean by the equator. To convert the data from Kemano Local to UTM grid in AutoCad is as follows. TO CONVERT FROM LOCAL TO UTM GRID 1. MAKE A BLOCK OF THE OBJECTS TO BE MOVED. 2. SCALE THE BLOCK BY 0.999533 AT THE KEMANO BASEPOINT [E 15581.919, N 12932.292 ]. 3. ROTATE THE BLOCK 0.8414194 DEGREES COUNTERCLOCKWISE ABOUT THE KEMANO BASEPOINT. 4. MOVE THE BLOCK 554840.756m EAST AND 5920078.794m NORTH. Below is the information that I received from the engineering company about the local coordinate system.
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06-26-2017
07:42 PM
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I have data in a local projection. I want to convert it to UTM zone 9. I have the control drawing and a word doc on how to convert the data to utm projection in Cad but I don't know how to use the data in Arc. The coordinate system of the data stats that it is in UTM 9 but it shows up by the equator in the middle of the pacific instead of northern British Columbia. I believe that I need to use the data for the local projection but I have been unsuccessful in doing this.
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06-22-2017
01:14 PM
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I need to buffer a point feature to an irregular shape. The buffer needs to be 20m x 80m x 80m x 100m from a center point.
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05-15-2017
02:27 PM
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I have 5 geodatabases with identical data but of different areas. I am trying to append data from all five to one new geodatabase. There are about 50 feature classes in each geodatabase so I am looking for a script to automate the process. Thanks
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07-26-2014
09:18 AM
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Hi Steve The problem that I was having was with the the final step in ArcGIS, delineating the flood plain area. Since I wrote the post I was able to create an accurate output. I converted my DEM into a TIN and it seemed to work. Thanks for getting back to me. Perhaps you could shed some light on another issue that I am having though. I am having difficulty with modelling low flows. When comparing my outputs with historical floods my flood inundation area that I created at 200cms is comparable with the historical flood area of 340cms. I suspect that the elevation information that I have for the river bed is not very precise and that is part of the reason. When I enter very low flows, even 1cms, I still have flooding occurring outside of the river banks? Any suggestions that you could give to explain would be greatly appreciated. Ian Kirschner
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04-22-2013
06:04 AM
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Hello I am doing a flood model for a town. I have created the river geometry using a 50cm DEM. When I bring the RAS layers back into ArcMap I am unable to delineate the flood area when using the DEM. Any suggestions? Ian Kirschner BGIS Student SAIT polytechnic Calgary, AB
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04-13-2013
06:07 AM
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Hello I am doing a similar project to ET_oile. I need to create flood polygons. I have a depression less DEM for the water shed area. I have known water level and corresponding flow rates from a water gauge stations in the center of the city. I am having difficulty figuring out the ArcHydro tools. Any suggestions on the work flow and specific tools I should use to create accurate flood polygons for different water levels?
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03-25-2013
07:02 AM
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