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I am experimenting looking at the sentinel 2 imagery freely available in Esri Living Atlas and ultimately would like to use it as a tool for quick change detection in vegetation. I can open the imagery in ArcMap and have also played around with it in Sentinel Explorer app online. What I am not sure of however is how to access earlier imagery which according to the supporting text is available. I also can't seem to see any other image in the Sentinel explorer app either, even though in the dropdown list it appears I should be able to select an earlier image (12 months ago). But I can't seem to get it to display. So currently all I can see is an image from a few days ago. Thanks for help with this - I am not highly experienced in using ArcGIS online to access data so it could be I am missing something obvious with this, but I am also failing at using the explorer app currently, so possibly there is only 1 image date available at the moment??
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05-31-2018
08:46 PM
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Hi, I am just wondering if anyone has built up a symbol library for fluvial mapping as per Dackombe & Gardiner's Geomorphological Field Manual (1983). Thanks
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01-24-2017
06:53 PM
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Thanks Gabriel, That sounds like a great suggestion and yes I was thinking however I did it would have to be one way and then flip the scenario. Overnight I thought about it and also came up with a sneaky alternative – by converting my potential takeoff gridcells to points with a table value of their height. Then doing a find nearest polygon distance (suitable landing layer)and the table would be populated with that distance. Then just use calculator to populate another field with the 1.8 x height and then just have a fourth field showing which points have a flight formula value greater than their distance to nearest landing polygon. Again a one way analysis. Fantastic to know I have a couple of options to play with and now to just edit and fine tune my data before running it all. Thanks again for taking the time to help me. It is very much appreciated. Lisa Redmond
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04-15-2015
12:42 AM
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We are working on a project that is looking at potential crossing points for Squirrel Gliders between patches of trees on either side of a freeway. We have mapped vegetation over aerial photos and the formula for potential flight distances we will use is "x"=1.8 x tree height. I have a digital elevation model of the tree heights that I can use. What I would like to do is have one raster (Raster A) on one side of the road that has values 0 (no landing potential) and 1 (1 being acceptable landing locations), the second raster (Raster B) on the other side of the freeway will have values 0 (no takeoff veg) and where there is acceptable takeoff vegetation the value of each pixel will be a height value of the tree canopy of that pixel. The result I would like to try and achieve is to create a new output raster (Raster C) showing just where: pixels from Raster B are identified that are within a distance of 1.8 times by their value (height) from any pixel with a value of 1 in Raster A. I am new to this forum and I dont expect anyone to do all the work for me but I just want to try not to waste my departments time and money if I am going the wrong way about approaching this problem. I am sure there are other ways approach this also.. I dont have experience with python or model builder but If someone can assure me that what I want to do can be done and direct me to how to go about starting on it and what sort of tool/script to use to work on it I would be very thankful.
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04-14-2015
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