Latest Contributions by MervynLotter

Hi Curtis Thank you for advice. I was able to successfully use the Greater than function using the function editor to extract all areas above a certain elevation (output had values of 0 or 1).  See below image. What I figured out was that I needed to add an elevation threshold under the second input raster. I would have thought there may be an option for providing a threshold but this worked. Is this the correct workflow or should I have added elevation threshold as a Constant instead of Raster Variable? I did not need the Con function .... but I wanted to see if i could get it to work.  I managed to do so although I found that when stringing together two or more functions then I need to add altitude threshold as a constant as I could no longer edit the Raster2 in the Greater than function without opening the Function Editor and manually changing it.  ... View more

Hi Dan (and others) I agree that using the Con statement is a bit of an overkill but I was struggling to find a "function" that I could use to extract values using *Raster Functions*. I agree 100% with your suggestion if I used the Raster Calculator tool to perform the analysis. In my call for help, the problem with the Raster Calculator is that it creates an output raster to disk. I am looking for a method to create a temporary feature that shows the elevation (in my example), without creating an output raster. Raster Functions are really great in creating these temporary products for visualization and analysis and I am starting to use them more frequently these days. So I was looking for an appropriate raster function that I could use to extract values from a DEM. I just cant figure out how. Under the Help menu in Pro ( https://pro.arcgis.com/en/pro-app/help/data/imagery/list-of-raster-functions.htm) there is a section on Raster functions, specifically "*What are the functions used by a raster or mosaic dataset*?", which lists the various function available with a brief description of each. Some functions of those listed only apply to overlapping rasters (like the arithmetic function). The "basket" of functions which may include the answer to my problem is probably under the Local Functions ( https://pro.arcgis.com/en/pro-app/help/data/imagery/local-function.htm). The Greater than function only works on two or more rasters so I cant consider this function as a solution. I still think that the Con raster function may provide the necessary output. There is also a Calculator Raster Function but I cant figure out how it works. It would be great if the Help section provided some examples. The help item on the Con function states "*When a Con operator is used, there usually needs to be two or more local functions chained together, where one local function states the criteria and the second local function is the Con operator which uses the criteria and dictates what the true and false outputs should be*." I have tried the Function Editor but no luck in figuring out how to insert the statement or string together the Con functions in any sensible manner. To summarise, I am still hoping that it is possible to use Raster Functions to extract values from a DEM, whether using Con functions or any other function (or string of functions as a template). I have in the past occasionally used Symbology to manually classify my elevation into two classes using a certain elevation threshold, but using a Raster Function would be far more efficient and elegant .... Best wishes, Mervyn ... View more

Dear Dan and Adrian Thanks for the advice and comments. Dan, from what I can gather is that the coordinates you see in your screen shot are actually from the attribute table of the point feature being queried.  This is the behavior that I observe (see below screenshot - clicking on polygon and point features). Using this approach for determining coordinates would require that one can only query known point features which have the coordinates in the attribute table. Adrian, the " What's here?" tool is dependent on the use the ESRI World Geocoder service (and any other locate providers added under settings) to highlight the points of interest and coordinates of the features close to where one is clicking on the map. This approach could work well in urban environments where there are many points of interest available. Disabling the geocoder in the locator settings results in no features being returned and no pop-up windows with coordinates opened. My current area of interest is Mozambique and the data is seemingly much more sparse as very few records are returned when trying the What's here? tool. I have added several of my larger feature layers with a good coverage to the Locate tool using the Create Address Locator geoprocessing tool, such as rivers and a gazetteer for Mozambique, hence I am able to get some success when there are features close by. To Dan and Adrian, thank you for the two suggestions but neither can fully provide the functionality that was available in ArcMap. I will try and add as a suggestion to the ArcGIS Ideas site once I can login to the site (I have never been successful in doing so). Luckily I see the Ideas site is migrating to Geonet. ... View more

Hi Dan Thank you for the links and taking the time to reply. You really are quite extraordinary in the kind manner if which you so freely and enthusiastically help all of us struggling to master Pro (and other Esri products). Thank you! Back to my problem at hand, I did explore your links and the Explore tool's functionality but I still cant find any way of extracting the coordinates for a point when I click on a map. The pop-up window would be where I would expect it and I hope it can be integrated into this window at some point. To me it seems very useful to know the exact coordinates for a point queried. Judging from the response to my query, I gather that it is currently not possible to extract the coordinates as hoped. Best wishes, Mervyn ... View more

Hi there I would just like to provide an update to this post of mine. I did submit a repo case in December 2015 and this is a bug in Pro 1.1 (BUG-000092927: : Duplicate labels are appeared in the Exported Map as a TIFF, JPEG or PNG in ArcGIS Pro). I did not read that this bug had been fixed in Pro 1.2's release notes and I can confirm that it has not yet been fixed in the official release of Pro 1.2. I am sure to Pro dev team have a lot on their plate. Regards Mervyn BUG-000092927 ... View more

Hi there I just want to provide an update .... uninstalling Pro 1.2 Beta and then reinstalling Pro 1.1 did not work and Esri Tech support had to resent my licence. Regards Mervyn ... View more

HI Tim Pro does have hatching, and an improved range of options I think. 1. Open the symbology pane. 2. Right-click on the colour/feature that you want the hatched symbology. 3. Select Format symbol(s) 4. The Format Polygon Symbology pane will open. 5. Select the middle icon (Layers) 6. Under the drop-down, select hatched (default is solid) 7. From there you can change the Pattern or Appearance. It really works very like a charm... Regards Mervyn ... View more

Hi Litan If you have access to the Spatial Analyst toolbox, one approach may be to convert each polygon to its own raster, then use the *Band Collection Statistics* tool to calculate the statistics for the set of 3 rasters. Make sure to tick the optional Compute covariance and correlation matrices option. The output is text file providing various statistics. The correlation matrix is useful in that you can now compare (via correlation) how similar each of the rasters are to one-another (and your "standard" layer). For a quick whirlwind tour of every tool in the Spatial Statistics toolbox, do watch this tech session video from last year's Esri User Conference http://video.esri.com/watch/4702/simple-ways-to-do-more-with-your-data-using-spatial-statistics Good luck. Mervyn ... View more

Hi Antonio If you want to* create* a polygon shapefile from scratch, as your question was titled, then you need to run the Create Feature Class tool and* only provide the name of the folder where you would like the shapefile stored* under the Feature Class Location. Then provide a name under Feature Class Name (you can add the .shp extension if you want, but it will still create a shapefile if you dont), select Polygon as Geometry type (it is the default I think), select your coordinate system then hit run. Regards ... View more

Hi Peter A crude solution may be to limit the cost surface to the road network only. You could buffer the road network by a suitable distance, convert to raster, and convert the non-suitable areas in your slope cost raster to NoData. I am not sure if it work but worth a try. ... View more