Latest Contributions by ChrisDonohue__GISP

I don't know the exact answer myself, but I did notice a thread where users experienced similar issues and had some suggested solutions: Rejoin parcels - Land Records Meetup (Redlands, CA)| Meetup  Chris Donohue, GISP ... View more

That's not unexpected - it can take quite a while to clip an aerial if it is a large size.  Though if it takes more than several hours, then one may have to decide whether the program crashed or not.... Chris Donohue, GISP ... View more

In general it is possible to do this with Modelbuilder.  I say in general as I'm not familiar with GPX files and "gpx to points" tool you mention.  To help in providing a more defined answer, can you describe which software platform you are using?  ArcGIS Desktop, ArcGIS Pro, ArcGIS Online, other?  Also, what version?  Are third-party tools being employed or is the current process all with ESRI software? Some ideas: Note that if the "gpx to points" tool that is mentioned is from a non-ESRI program, it still may be possible to run it using Modelbuilder.  The following link has an example using "R", but other programs can be run ("called") in a similar matter. Integrating external programs within ModelBuilder—Help | ArcGIS for Desktop  In terms of automating the processing of the full dataset, at least one Iterator will be needed: A quick tour of using iterators—Help | ArcGIS for Desktop  In the project you have described, it may actually need two Iterators - one to loop through (pick) a GPX file and a second to loop through the selected GPX files records.  This is a case where one typically would take a Submodel approach - one model to pick the GPX to work on from your collection, and another model to process the GPX file.  This submodel approach will need to be done as it doesn't work out to have more than one Iterator in a model. Integrating a model within a model—Help | ArcGIS for Desktop  Chris Donohue, GISP Note - edited for improved clarity ... View more

(in fact many feds have had to cancel -- USGS was restricted to 8 attendees) Just curious - is USGS the only federal agency with reduced attendance at the Conference this year or did other federal agencies suffer attendance restrictions also? Chris Donohue, GISP ... View more

I didn't go into detail on how to use Grid Index Features, so sorry for the confusion.   The deal with using this tool is one needs to fill in several of the settings, some of which are not intuitive. Input Features (optional):  use your points layer Number of Rows (optional):  Number of the maximum count of points in the X dimension Number of Columns (optional):  Number of the maximum count of points in the Y dimension Then run it.  Note that the goal is to have one "box" (in the GridIndex) per point.  Note that the resulting grid will have the points somewhat scattered around each box, i.e. the points won't be exactly in the same point in each box.  But that's OK, we're using the grid (boxes) purely to derive the sort order, not as a final result. In the resulting GridIndex, there will be a field called "PageNumber". That field represents the draw order for East-West, so that one is ready to go if you don't mind that it will create the extra diagonal lines as it creates the East-West linework (details on how to clean that up below).  The North-South order will need some processing of the existing attributes to derive it.  Start by creating a new field (text) in the GridIndex like "SortNorthSouth" (Short Integer).  Then use Field Calculator with the following VB statement (or use the Python equivalent):  Right( [PageName],1 ) Note that you may have to play with the value after the [PageName], depending upon how many digits your numbers have to correctly capture the value.  For example, if the number values go up to 99, use ",2".  You will now have a grid that can be Spatial Joined to the points that will provide the proper order for lines to be drawn to the points. Target:  Your points Join Features:  the GridIndexFeatures Match Option (optional):  HAVE_THEIR_CENTER_IN Next is the Feature to Line Geoproccesing Tool on your joined points, with one run for the NorthSouth lines and a second run to do the East-West lines: - For each run use the Sort Field (optional) set to the field that provides the sorting. The final result will look weird at first and need some final cleanup: -The North-South lines will have some East-West segments. -The East-West lines will have diagonal segments. I'd start by getting rid of the diagonal lines in the East-West linework by starting an editing session and manually selecting and deleting them.  There's probably a more elegant way to do this, but I'm blank at the moment on how to do it. As for the unwanted East-West segments as part of the North-South linework, there are several options to eliminate them, but the easiest is probably to Union the North-South layer with the cleaned up (no diagonals) East-West linework, then taking the output and running a Dissolve on it. Note that if at the end of all this you need their to be distinct lines between each point, there are several methods available to break up the lines at intersections and points. Methods for splitting line features—Help | ArcGIS for Desktop  Anyways, give this a shot.  There may have to be a few tweaks here or there to fine-tune it for your data, but it should work. Chris Donohue, GISP ... View more

I think Dan Patterson  is right in that the file name is too long. In the raster world shorter is better for filenames. Also, it looks like there is a space in the path.  Spatial processes sometimes choke when there is a space anywhere in the file path or in a file name.  Try renaming the folder with the space.  For example, use an underscore between BA and Projekt. F:\Jessie\BA _Projekt\.... Also, in general, I'd avoid using the Default Geodatabase for raster processing.   Instead, set up an output geodatabase specifically for your project.  This way you know the Environment Settings and such will be appropriate. Chris Donohue, GISP ... View more

If the data is not perfectly North/South and East/West, an approach that would work that builds on what Abdullah Anter suggested would be to create a North/South and East West exact grid that covers the extent of your points by using Grid Index Features (geoprocessing tool), then derive the Sort Order for that Grid.  Next, Spatial Join (geoprocessing tool) the grid to your actual points (so the sort order gets transferred over).  Then you can run Abdullah's suggestion based on the exact grid sort order fields so the lines are drawn in the correct sequence (as opposed to the real points sort order, which can lead to backtracks). Grid Index Features—Help | ArcGIS for Desktop Geoprocessing Tool Spatial Join—Help | ArcGIS for Desktop Spatial Join Geoprocessing Tool.  For the "Match Option" setting, use "Have their Center in" Chris Donohue, GISP ... View more

Abdullah Anter has an good approach.  However, check the output carefully, as unfortunately there will likely be issues if all your points are not all aligned exactly North/South and East/West.  If they are not aligned exactly, some of the resulting lines will be "backtracking" and require some cleanup.  Still, this is a good start that may resolve most of your lines (and probably be easier than drawing all the lines manually). For example, note that the Y value for the point circled in red is slightly higher than the Y values for the points on either side.  When the line is drawn automatically, it bypasses this point, then backtracks later to it. Chris Donohue, GISP ... View more

Point of clarification - if I understand correctly, you have all the lines depicted in the first example, but need to cull them down to only the quarter section ones (so a subset) - is that correct?  If that is the case, are the lines already attributed so you know which ones are the section lines (so there is a basis to then do the quarter-sections)? Also, points are shown in the examples.  Are the points attributed in any way that would help define which lines are section lines and which ones are quarter-sections?  I ask as one way to do this might be to build the lines from the points using Points to Lines, but before doing so the points will need attributes that allow the correct assembly. Points To Line—Help | ArcGIS for Desktop  Another question - are the lines all roughly North-South and East-West, or are some of them in other orientations (like NW-SE)?  If they are all North-South and East-West, one may be able use their increasing X or Y values to help in differentiating them. Chris Donohue, GISP ... View more

1.  Echoing what others have said, before you get to the Conference have a tentative schedule figured out for each day.  - Plan ahead.  Have at least two things to do each time slot.  Sometimes you get to one session and find it isn't what you expected, so if you are already organized this will give you a opportunity to quietly slip out and quickly get into another session. - Be ready to be flexible.  You may discover during one session that there are other sessions coming up in topics you had not considered before and now want to attend. - If you find you have a time slot where none of the Sessions/Presentations seems appealing, don't forget the Map Gallery and the Exhibit Hall.  In particular, check out the Demo Theaters in the ESRI section of the Exhibit Hall and the "hands-on" computers available with ESRI Staff on hand to answer your questions.  This is a great opportunity to get those questions answered for situations where you've always wondered "why doesn't this work" or "I wonder if that can be done with GIS". 2.  The official lunch break can lead to quite a crowded lunch situation near the Convention Center.  Consider instead taking the early afternoon session off and going to lunch then on some days to avoid the lunch crush.  In particular, consider taking this break on Wednesday and/or Thursday, as by then one usually is in GIS saturation mode. 3.  Wear comfortable shoes, as you will be walking alot. Chris Donohue, GISP ... View more

Another complexity I just realized - your organization is at the County/Parish level.  The assessor level.  In the United States, there are accuracy and processing specifications that can dictate how tasks get done because of the County's authority/responsibility as the final word in determining parcel boundaries.  Or to put it in a different way, when there is a disagreement over a boundary, it goes to the County to resolve.  That brings into play a whole added set of protocols and legal processes that need to be adhered to when processing data that other levels of municipalities don't necessarily need to worry about to the same extent.  I would research what the legal requirements are, as at the County level there are often specific expectations and there is the reality that data does get challenged. Chris Donohue, GISP ... View more

I can understand where you are coming from as I got thrown into a similar fire when our Department inherited the Subdivision update responsibilities for our City from another Department when that Department's GIS Analyst retired.  It took several days to sort it out (and my colleagues and I have quite a few years of GIS experience). This could get complex really fast, so you may want to see if you can find another person with GIS skills in your organization that can help you walk through it or bring in an experienced GIS person on a temporary basis.  This will be particularly important if the subdivision map is not just a generalized one but instead needs to be accurate at the parcel-level. There are a whole ton of variables in how to accomplish this task based on how your organization is set up.  For example, what data storage is in use by your organization?  Enterprise geodatabase (SDE)?  File Geodatabase?  Shapefiles?  Other?  Is the data tied to other data using Relationship Classes?  Each one of these has implications for how one goes about editing the data.  Without a GIS background, it will be difficult to figure this out without some resources/expertise.  I suspect just having someone do a screenshot share and walk through it won't really work as there are many complexities.  I'm not saying this task is impossible, just that it is not simple. Another possible technical resource to consider would be GIS people in other local municipalities.  If you there is a neighboring organization that uses GIS that you are familiar with, consider giving them a ring and ask if you can borrow their expertise.  It can also sometimes work if you add "if you help me out, I'll buy you some beers after work" On the longer term, consider lining up basic GIS training so you can get a feel for what is involved and be better able to communicate with technical staff, it at least from a management-level understanding.  Every specialty has its own lingo and half the battle in managing/coordinating is understanding what staff are doing in their discipline. So to summarize, based on what you have provided, short of it being just a very-generalized subdivision map needed, this likely will not be a quick and simple task to accomplish.  I'd see about lining up some resources and expect that it will take some time to accomplish this task. Chris Donohue, GISP ... View more

I would try the Identity (Analysis) geoprocessing tool if you have access to an Advanced ArcGIS Desktop License.  I just ran a test dataset and it worked well.  In the tool dialogue, for the "Input Features", use the State Roads feature class and for the "Identity Features", use the Divided Highways feature class. Note that you will likely want to do some followup table cleanup after running the Identity.  For example, it is likely you will want to delete the resulting FID field (created as part of the Identity processing). Identity—Help | ArcGIS for Desktop  Another different way to tackle this would be to use Feature Vertices to Points with the output option set to "Both Ends" on your Divided Highway line segments to generate points, then use the those points to split your State Highway lines using the Split Line at Point tool.  Note that both tools require an Advanced license.  This will get the linework in order, then you will need to do a Spatial Join, or selections and manually calculate values to populate the attributes in the new output. Feature Vertices To Points—Data Management toolbox | ArcGIS Desktop  Split Line at Point—Help | ArcGIS for Desktop  Chris Donohue, GISP ... View more

Tagging for greater exposure: Public Safety 911 GIS  Chris Donohue, GISP ... View more