Get Spatial
Reputation
8,747
Top tag
Next privilege 10,000 Rep.
Access moderator tools
 Feb 2 awarded Yearling Jan 26 comment Building a DEM with both a raster and vector points I am not sure where you have been looking, but you might check out this resource: General Bathymetric Chart of the Oceans It looks to be 30 arc second coverage which is significantly better than 3000 meters. It still won't mesh well with a 30 meter grid, but will at least show you some more detail. Jan 26 comment Building a DEM with both a raster and vector points Your last sentence in your last comment illustrates the entire problem. You are not going to be able to get decent bathymetry by combining a line indicating sea level, with a 3000 meter grid bathymetric layer. There is simply not enough resolution in that layer to give any detail related to underwater fishing pockets and the like. If you want that sort of detail, you need to find a higher resolution source of bathymetric data. No spline interpolation or other form of creating contours will solve the underlying problem of lack of resolution in your source data. Jan 25 comment Building a DEM with both a raster and vector points You have a valid point. Given that, though, it begs the question of what your intended use of this layer is? That is a huge gap in resolution that one way or another is going to cause trade-offs in how you can use it in the end. If it is simply for illustrative purposes, is it worth combining them at all, or simply leaving them separate? Jan 25 comment Building a DEM with both a raster and vector points Since you want to end up with a raster DEM, there is no need to convert to contours prior. You should be able to create a DEM from your 3000 meter bathymetry. Since that is your lowest resolution data, you will need to convert the 30 meter elevation DEM to a 3000 meter grid. You should then be able to combine them together. Some things to think about are making sure they are the same projection, and that the grid is using the same x and y values. What I mean there, is if one is numbered 0, 30, 60 and the other is 10, 40, 70, some interpolation will be required. Jan 2 comment What is the SRID of census.gov shapfiles? @neubert - I did use SRID 4269. In the answer, the text string that I pasted in, which includes the references to 94269, is copied from the SRID 4269 string formatted for PostGIS. I am not sure why it includes that, but there you have it. Dec 2 comment Mass ArcPy GDB Load Another note is that you are using Arcpy. Is this operation running on your desktop, or on the server? If at all possible, I would try to run this at the server level. With that many records, even if the records do not contain a large amount of data each, you may be running into a memory issue. If you are running out of RAM at the 2M record mark and having to start swapping to the hard drive, this could be the source of the slowdown. Dec 2 comment Mass ArcPy GDB Load A couple of things. First, are you confident of where in your arcpy script the slowdown is taking place? I could see the append taking much less time than adding an attribute and then updating that attribute. You might consider doing these operations once the data is in the RDBMS environment as it should be much quicker. As well, for loading the data, have you considered using a different method? To be honest, the capabilities of the RDBMS to bulk load data are potentially much quicker without the ArcSDE layer in the middle. Load using SQL to a table, then register with the geodatabase. Nov 19 comment All layers disappear after using OpenLayers What do you mean by use the openlayers plugins? What operations are you doing with them when you load them in? Does the data disappear when you load in the plugin, or after you attempt to perform a command in one of the plugins? The more detail you can provide about the process you took from loading in the data to when it disappeared, will likely help someone answer your question. Nov 5 comment Creating polygon features on scanned historical maps to measure areas in ArcMap? To add some clarification, you cannot create polygon and line features in ArcMap if you do not have a layer to add them to. They are vector features. Your `.jpg` is a raster layer, which is a different data type. This question and answers detail the differences between the two data types: What are Raster and Vector data in GIS and when to use? Nov 5 comment Water main Flushing One method may be to use a shortest path routing algorithm. This will select the water lines on the shortest route between your start and finish. Use those to select the valves along that route, then reverse selection on the valve layer to select only valves that do not fall along that route and shut them off. This should serve to isolate your desired route. Nov 5 comment Combining iterators and lists in ModelBuilder? The calculation model is designed to iterate over all the feature classes in a single Geodatabase or Feature Dataset. It is designed for a single input. If you want to have that model run over multiple inputs, then that model needs to be contained inside an iterating script which would be part of the smaller model you want insert the calculate model into. Nov 4 comment Can ArcGIS for Desktop auto populate Date Field with current date/time when feature is created? This link seems to support your answer. It specifically states that autopopulating is not possible. It is a few years old, but nothing newer is coming up that is relevant. Feel free to incorporate this into your answer for a source direct from Esri. Nov 3 awarded Altruist Oct 31 comment Projection error, geotransform not valid Welcome to GISse! Some additional information would probably be helpful. Please tell us more about where the data is located spatially. Where is the output coordinate system coming from? It says custom, so is this something you determined from looking at another dataset? You say the weather station locations are xy NAD83. What does this mean? What projection are they actually in? Do you actually mean lat/lon NAD 83, or an actual projected coordinate system? The more detail you can provide about your data and your goal, the more likely you are to get a helpful answer. Oct 31 comment Increase python script speed I'm voting to close this question as off-topic because the person who asked the question had to remove all parts of it and is unable to delete the question themselves. Oct 30 comment Batch load rasters to mosaic dataset One other option if you are working in the ArcGIS sphere, and simply need to do this for viewing purposes, is to create a Raster Catalog. These are pretty well optimized in that you only load a single object into ArcMap, and the Raster Catalog handles which rasters to load in based on spatial location. An unmanaged RC simply acts as a pointer to existing rasters, so no need to import them anywhere. Oct 30 comment Batch load rasters to mosaic dataset It is possible to run the Mosaic tool on files that are not yet added to ArcGIS. You can simply browse to the directory and select the desired files. This would potentially avoid the problem entirely. You may also avoid performance issues caused by trying to render 200 rasters being loaded into ArcGIS all at once. Oct 28 awarded Investor Oct 28 comment How do I set the composer layout units to inches? I am also having this issue. Can any of the QGIS developers weigh in about it?