Latest Contributions by ChrisDonohue__GISP

‎02-05-2016

An alternative approach, if I may: Add an inset map (locator map) which shows the County, then use the frame in it to show the extent of your main view. This will provide your viewers with a context of where your main view depicts. Using extent indicators to enhance overview or locator maps—Help | ArcGIS for Desktop So, on the nuts and bolts side, in ArcMap, 2 Data Frames, with an Extent Indicator set up on one showing the extent of the other. Chris Donohue, GISP

‎02-05-2016

Just at thought that may stimulate some ideas: Is there a standard methodology for determining response times that is in use for Response? I know our City's Fire folks have mentioned trying to achieve a certain level of response based on time, so I'm curious - is there a standard? I suspect it won't one be one down to GIS-level details, but maybe one that lays out the expectations? If there is, would that provide guidance that could then be used to help in then deriving how to handle turns? Chris Donohue, GISP

‎02-04-2016

Some more ideas, assuming the data is spatially identical: Spatial Join - start with one layer then do Spatial Joins to the rest. Spatial Join—Help | ArcGIS for Desktop Identity (Analysis), with the Join Attributes (optional) set to All. Identity—Help | ArcGIS for Desktop Caveat - both of these this place all the attributes into one feature class, but you will still to follow up with an additional process step to do the sum. Chris Donohue, GISP

‎02-04-2016

Erase (Analysis) doesn't work in a Versioned environment, unfortunately, due to the constraint on processes that create new data. However, if you export your data to a File Geodatbase, you are free of the enterprise geodatabase limitations. You can then do all the processing of the data, then Append the results back into the Version. If you don't have the Advanced license required to have Erase available, there are several workarounds: 1. There's Python - see the script Darren Wiens posted. 2. If you have XToolsPro (third-party software add-on), there is an Erase Features function. 3. You can run a Union (Analysis) which is available at all license levels, and then go into the attribute table and do a selection to essentially recreate the results of an Erase. The output feature class will contain a FID_<name> attribute for each of the input feature classes. For example, if one of the input feature classes is named Soils, there will be a FID_Soils attribute on the output feature class. FID_<name> values will be -1 for any input feature (or any part of an input feature) that does not intersect another input feature. Attribute values for the other feature classes in the union where no intersection is detected will not be transferred to the output feature in this case. ArcGIS Help 10.1 - Union (Analysis) Chris Donohue, GISP

‎02-03-2016

Representations offer many controls over how the data is displayed. They are time consuming to set up, but can be well-worth it for if you are going to displaying the same data over and over. Representations can help one avoid having to edit the data just to make it display correctly. The underlaying data stays the same and the Representation instead handles its display. For example, if you have two coincident features, you can use the controls in Representations to show them side-by-side instead of overlaying each other, which may make the idea clearer to users if it is showing subject matter like bus routes both on the same street. Layer files are far easier to set up, but are more limited in how they can affect the display of data. For the data to be displayed clearly, you may end up having to edit you base data just for display clarity. While this can be workable for a one-time project, if there are a succession of maps of the same basic material that need to be made and there are data changes, one will have to go back and re-edit the data not just for the changes but also to make it display correctly again. Plus you can end up with multiple data sets, a source layer and one or more display layers. This offers potential for confusion when data edits need to be made - which parts of the data are there only to make it display correctly? You have to remember what was edited for display and why, and then redo it every time. So it usually comes down to how complex the display is of your data, and whether you will be using the data over and over for maps in comparison to a one-shot project. Chris Donohue, GISP

‎02-03-2016

I bet Melita Kennedy would probably know. Chris Donohue, GISP

‎02-02-2016

I run into this also with my work for the City and have not come up with a great way to do this (but am still looking). Here's two workflows that may help: Given the geoprocessing limitations that come with Versions, I usually opt to dump the data out to a File Geodatabase, do the necessary geoprocessing there, delete the affected polygons in the Version, then Append back in the new polygons to the Version. Tedious, but it works. Another workflow that can be effective if there are only a few features to update is to use the Attribute Transfer tool (Spatial Adjustment Toolbar) to update the geometry and/or the attributes while still in the Version by "transferring" the information from a source feature class. If you do go this route, 2 tips: make sure both the source and target layers are selectable, and after making the transfer, realize you may have to Refresh the view to see the geometry changes (it often lags, making it seem like nothing happened). EDIT - added more images. Chris Donohue, GISP

‎02-02-2016

Just a guess - maybe the original poster meant Avenue -the scripting language used with ArcVIew (not AML). Chris Donohue, GISP

‎02-02-2016

Some thoughts: I'd suggest checking the coordinate system of the LidAR by using ArcCatalog and see if it matches the same values that are in the State Plane coordinate system that it is expected to be in. What are you checking the LidAR against? Are you absolutely certain that the layer you are checking it against is correctly located? 500Km sounds like it is larger than a simple Datum shift (like NAD27 to NAD83). Any chance a False Easting got assigned? Chris Donohue, GISP

‎02-02-2016

I don't know the answer, but let me add a group that has folks that may know: 911 GIS Chris Donohue, GISP

‎02-02-2016

Besides the suggestion by Jake Skinner, I would check to see if the imagery actually already has a projection assigned. Use ArcCatalog to check the properties. My guess given your symptoms is that it does not. The world file( tfw) often only provides the correct location if it was already in the correct projection. Since it likely has no projection.... ArcGIS Help (10.2, 10.2.1, and 10.2.2) Chris Donohue, GISP

‎02-02-2016

Can you elaborate on that? To confirm, were you able to get to ArcGIS online? Or were you unable to find data once in ArcGIS online from the search window? In case it helps, here's another image on how to get to ArcGIS Online while in ArcMap. IMPORTANT point / easily missed - be sure to click on the "triangle" next to the "plus sign", not the "plus sign". By clicking on the "triangle" the pull-down will be available that will then allow choosing ArcGIS online. Chris Donohue, GISP

‎02-02-2016

I agree with Xander Bakker that the dashes in the file path may be an issue. Maybe try using a different folder structure that does not have dashes? A general suggestion. With Grid files, shorter is usually better in terms of paths and filenames. Oftentimes if the combined length of filename and path is long, there can be issues. Yet the same process will often work fine if the path is simplified to be very short. In theory it shouldn't matter, but there can be a difference. So try a shorter path, that may resolve it. ArcGIS Help (10.2, 10.2.1, and 10.2.2) - ESRI Grid format Chris Donohue, GISP

‎02-02-2016

There are a variety of data sets out there that could be used. A starting point to find some of them is to use the "Add Data from ArcGIS Online" function in ArcMap. Type in a search term(s) and start browsing the datasets. Chris Donohue, GISP

‎02-01-2016

Just an idea - if you have an attribute that differentiates the polygons by the State, you can run the Dissolve (Data Management) tool using that field to create a new feature class that shows the states. Dissolve (Data Management) Chris Donohue, GISP

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My Ideas

Latest Contributions by ChrisDonohue__GISP

Re: Cartography / Mapping - symbol for partial city or county boundary?

Re: What are realistic global turn delays for fire engines?

Re: merge multiple, identical polygon feature classes and sum selected fields

Re: Import polygons with auto clip?

Re: Layer file vs. Representation

Re: NAD 83(2011) to NAD 83 - Which transformation should I use?

Re: Import polygons with auto clip?

Re: What are realistic global turn delays for fire engines?

Re: LiDAR showing up east of actual location

Re: What are realistic global turn delays for fire engines?

Re: Question about tif and tfw files?

Re: Where can I find maps of Globe natural hazards?

Re: Sum 6,000+ rasters - Python script

Re: Where can I find maps of Globe natural hazards?

Re: Outlining my states

Re: ArcGIS 10: Graphics won't display in Data View

Re: Can't set output as intermediate data

Re: Addressing - Plus Code or What3Words (W3W)

Re: How to label "_, Mount" as "Mount _" ?

Re: Raster/Vector Land use Analysis

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