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OK mate, hope it goes well. You're welcome too, pay it forward an all that haha
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02-13-2014
12:14 AM
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Hi Matthais, I've attached a word doc with a very quick run through on how to do what I think you're after. Like I said it was pretty quickly thrown together so if anything doesn't make sense give me a shout and I'll clarify it. Hope it helps. Ollie
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02-12-2014
11:13 PM
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So you mean if a building polygon is totally in the flood plain then it would be 100%, if a quarter of it was it'd be 25% etc?
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02-12-2014
05:05 AM
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Hi Adam, Yes I think the environment setting I mentioned does what you want it to do but as with all things Arc.... You never know til you try haha. Let me know if it works, I think it will because I'm almost certain I've used that setting in the past to do what you're trying to do. Cheers, Ollie
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02-09-2014
10:04 AM
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OK so spatial join by location should work then, right click your building layer and choose joins and relates > join. Use the drop down at the top of the dialogue to change from an attribute join to a spatial location join. Then select the layer you want to join them to and select the second radio button down to make sure each polygon is given all of the attributes of the polygon it falls inside, as in the attachment. Once you've done this you'll have a feature class or shapefile with the attributes of both polygons, you can then sum the area of the buildings per polygon by doing a dissolve based on the polygon ID within your building layer and divide this figure by the area of the flood map polygons. Times this figure by 100 to work out the percentage of floodplain covered by buildings. You can do this by adding a field in the attribute table to do your calculations in or you could export the tables and do it in excel, up to you I guess. Hope that helps. Ollie
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02-07-2014
03:23 AM
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Hi Jon, Do you have "Remove duplicate labels" ticked as one of the options in Maplex? Those values could be duplicated elsewhere in your dataset and be causing those polygon labels to be dropped out. Also, I don't know if it's the way your export has come across but the grid you're using to count these doesn't look consistent, i.e. some grids are skewed; this will affect your counts so it might be worth making sure nothing crazy is happening with it. Cheers, Ollie
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02-06-2014
11:14 PM
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Hi Harriet, You can specify the angles you want and the lengths by changing the fields in the attribute tables of annotation feature classes. If you use calculate field you can do them all at once too. I'd do it on a copy of your dataset first though because annotations love doing weird and wonderful things. Hope this helps, Ollie
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02-06-2014
11:05 PM
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Hi Matthias, This sounds like something you could use the intersect tool but I'm unsure without a bit more information. Do you mean that you want each building to have the attributes of the larger parcel? Also have you changed the order that you are joining the buildings to the parcels in, for instance.... try joining the parcel layer to the buildings and vice versa and see if this gives you the output you're after. Cheers, Ollie
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02-06-2014
11:00 PM
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Hi Adam, Have you tried using the environment settings? You can specify a shapefile or feature class as a mask in there and the geoprocessing tools will only run within its boundaries. Cheers, Ollie
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02-06-2014
10:54 PM
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No worries mate glad it helped, remember me when you're rich and / or famous.
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02-06-2014
10:42 PM
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Hi Brenton, Depending on the type of data you're looking to analyse I'd probably go for a fishnet grid in this instance. You can generate one using the tool in arc to cover your area of interest and also specify a resolution for the analysis by telling it how big you want each grid square to be, changing this will give wildly different results in some cases though choose one that you think best displays the relationships in the data. Once you've created your fishnet grid you can then do a spatial join to your point features, this will output a count field in your fishnet attribute table that is the number of points that fall within each grid of the fishnet. You can then symbolise by the count field to arrive at the effect you're looking for. Lines and polygons would be slightly different depending on what you're trying to acheive but it is something I've done before so I should be able to help with that too. Hope this helps, Ollie
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02-06-2014
05:45 AM
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Hi Danny, Have a look at these tools: Spatial Analyst Tools > Interpolation in the ArcGIS toolbox, these can be used to generate surfaces from points. The help files for each explain everything pretty well so you should find one you like the look of. Just be aware that the surface will then run to the tops of your buildings so there will be extra geoprocessing required to set the surface to the corrects height and burn the building locations onto the surface. Cheers, Ollie
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02-05-2014
04:52 AM
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