Latest Contributions by larryzhang1

Hi everybody, I am a new to ArcGIS. I am using a soil GIS production (gSSURGO). The UserGuide can be seen here (https://docs.google.com/file/d/0B61_JM-jDX9NRGlJZ2lHMVFCNTg/edit?usp=sharing). In this production, they have a raster file (the MuRaster_WV in Page 8 of userGuid), which have a ID key (mukey in Page 10) that is used for linking to other variables stored in tables. As you can see from userguid, they first load MuRaster_WV (P.8) and then link it with other three variables in muaggatt (P.17), and then show the spatial distribution for hydgrpdcd (P.20) and aws0150wta (P. 23). So far so good, but I want to resample and merge aws0150wta data. But I found I failed probably because the aws0150wta is still in table but not as a raster file (is it right reason?). Thus I am wondering how can I create raster from the value joined from a table in the production? An example data can be downloaded from here (https://docs.google.com/file/d/0B61_JM-jDX9NUFNFUjYwQTNoa1k/edit?usp=sharing). Sorry my mother language is not English. If you cannot understand, please let me know. I appreciate to your help. Thank you very much. Tianyi, Really intersting raster question. Just have the brief for your reference (resample, merge): 1. Convert /export raster with the attribute 'aws0150wta' from GDB via 'Raster to Polygon', (because the soil data is not 'continuous' raster); 2. Dissolve this polygone on 'aws0150wta'; 3. Convert back to raster; 4. Use the GP tool 'Resample' under Raster Processing (what is the intention for you to resample 'NON continuous' raster?) +++++ Note, The sample is not same raster that you are working. So far, it is not easy to identify how raster is associated with the attribute 'aws0150wta'. ... View more

Is there a way to batch export rasters with 4 bands to rasters with 3 bands? I am able to add each raster to my ArcMap session and export them one at a time by right-clicking and choosing Data, Export Data... and then choosing "Use Renderer" in the resulting dialog box. I have a bunch or 4-band (R,G,B,NIR) imagery and I'm trying to convert them to R,G,B for additional processing in another software program. If there's a better way, I'm all ears! Paul, For 'Batch' export (conditionally), I share the same idea to request ArcGIS 10.x having this capability as sooner as possible. Pls refer to the post at http://forums.arcgis.com/threads/85826-Exporting-rasters-as-a-batch-in-ArcMap?p=303823&viewfull=1#post303823 For specific band(s) export, for sure you can. The easy solution is: Step 1: create/load into MD; Step 2: use the function called 'Extract Bands' in the chain for 321; Step 3: export individually as same procedure as you done. For image processing in operation (dealing with massive multispectral rasters and /or panchromatic) , personally, it is still challenging for ArcGIS 10.x to 'effectively' do those tasks to meet high-level needs, including rectification (with/without GCP), pansharpening, and color-correction among rasters overall...... [INDENT]Pls refer to http://forums.arcgis.com/threads/27928-Collecting-amp-combining-GCP-during-creation-of-Mosaic-Datasets?p=92769&viewfull=1#post92769 and http://forums.arcgis.com/threads/19911-How-to-create-image-service-that-can-be-pansharpened?p=65043&viewfull=1#post65043[/INDENT] ... View more

Richard, On my understanding, ArcGIS GP tools like �??Building Statistics�?? are not functional for compressed images like SID (ECW and JP2 as well), even though the system does not create a warning message (I am not sure why it does not, bug?). In fact, it makes sense. In other word, if users plan to use those GP tools like �??color balancing�?? on raster images in MD, it is highly required to decode /un-compress those SID into regular images (saying, in IMG), before moving into MD. Regards, +++++++++++ Worth to mention, with color balancing /correction onto 13 images, it is still challenging for ArcGIS 10.x to 'automatically' correct colors among raster images in MD, which mostly will not satisify you. So, the efficient way is to conduct color balancing via the third-party packages like ERDAS ER Mapper�?� See the discussion 3 years ago at http://forums.arcgis.com/threads/19911-How-to-create-image-service-that-can-be-pansharpened?p=65043&viewfull=1#post65043 ... View more

Hi All Is there any way to perform Viewshed WITH consideration of buildings (as Multipatches) WITHOUT turning the buildings into DSM\DTM? layer? Since line of sigh GP tool can do it I tend to belive this option is exist. Thanks Ori, It is good question. Generally, you can do, because view-shed analysis with DEM is one of �??line of sight�?? analysis. When having a cell with height (x, y, z) like tower or building corner, the viewshed algorithm can be used over DEM for your case. However, with multipatch in ArcGIS, you need transfer the specific position to make it work with the viewshed algorithm (over DEM). Regards, ++++++++++ By the way, the concept of �??DSM dataset�?? commonly used in ArcGIS is arguable, especially, in engineering literature, because DSM is actually a data model (not dataset), which is constructed from very-high-resolution optical data (stereo-pair imagery, or LiDAR cloud points). In practice, �??bare�?? DEM must be obtained from DSM, before moving into GIS. 'DSM dataset' shouldn�??t be used in any strict GIS analysis/applications�?� Read at http://forums.arcgis.com/threads/95931-How-to-convert-a-DSM-to-DEM?p=341462&viewfull=1#post341462 ... View more

Has anyone successfully taken data collected in Leica Cyclone and brought it in 3D Analyst? If so, how?  Thanks! Caryn, Leica C10 data are point cloud datasets that are typically exported from Cyclone as either PTX or PTS files. Both PTX and PTS are Leica proprietary formats. However, ESRI 3D LiDAR model/GP tools look only for (open) LAS file format, and do not have capability to simply store reference to these PTX/PTS data files ... So, you need the third-party tool (free or commercial) to convert PTX or PTS into LAS, for example, �??pointzip.exe�?? (at http://www.cs.unc.edu/~isenburg/pointzip/) Regards ... View more

I think I am following the description.  You have 4 individual rasters with each representing a particular band. It seems you have processed the bands to remove the NoData and now want to combine them?  If that is the case, then use the Composite Bands tool. It will create a single raster with 4 bands.  Hopefully the NoData issue will be resolved by your attempt, but at worse will need to be handled at this point. Jeff, Frankly, I didn�??t try the GP tool (Composite Bands in ArcGIS) before, but fully believe that it will create one 8-band image from two 4-band images. On nodata, it can be configured with transparancy, which has no need to worry during any raster operations... ... View more

...  I have two 8-bit 4-band (RGB+IR) raster files, that are the same size and dimension, that cover the same area. The first has data in the extreme northeast corner, with no_data (0,0,0,0) everywhere else; the second has data in the extreme southwest corner, with no_data (0,0,0,0) everywhere else.  ...  I suppose I could try to run the calculator 4 times, one for each band (but I'm not exactly sure how to do that), and then try to figure out how to combine the four resulting rasters into a single 4-band raster (also, not sure how to do that).  Does it have to be this complicated? Surely there's a way to take two multiple-banded rasters, with the same dimensions and characteristics, other than where the nodata reside, and create a new raster which combines the two?  ...  Bruce, If I understand your case correctly (below), the solution should go with mosaic operation in raster imagery literature, rather than combination /merging. [INDENT]In AOI, there are two 4-band images spatially apart (one is located in NE; and another in SW). What you want is to â??combineâ?? those two 4-band images into one 4-band image. Concerns on nodata during 'combination'. [/INDENT] For example, just simply use MD model in ArcGIS (and then export from MD into IMG, when needed), no matter if two images have overlapping areas and same depth; or mosaic two via GP tool called â??Mosaic To New Rasterâ??, if have same depth and no overlapping between two images (here, it is better to use image extension in IMG). In fact, not need concern any nodata in raster images like 8-bit or 11/16-bit. Note, data cells (0,0,0,0) is not equalling to nodata. In fact, it is easy to automatically transform data cells (0,0,0,0) as 'BLACK' edge into 1 or any other digial number via Histogram adjustment. Besides, it is better to have same depth (in 8-bit, if different), before mosaic Regards, ... View more

It looks really good question, in particular, related to  geological formation units, geomorphology with hydrogeology (drainage basin, etc.) And it would be nice if ESRI Geostatistical/Spatial team can help answer... Regards, ++++++++++ In SAS (& others like S+ or R), the chisq option is used on the tables statement to obtain the test statistic and its associated p-value. And wondering if ArcGIS Geostatistical /spatial statistics  will apply this chisq function onto categorical geoscience layers. Really eager to get some deep insights on some statistics functions/algorithms on GIS layers (2 or more) to practically support many applications within ArcGIS, especially, over surface layers TIN/DEM for some analysis scenarios ... ... View more

... have a Digital Surface Model (DSM) with a cell size of 0.8x 0.8 and I want to convert it to DEM. Thus I want to get rid of elevated objects such as buildings and trees. Does anybody know if there is an available tool for this. ... Maria, If your DSM is refereed to a dataset, which contains bare DEM with 3D object heights on it, it is challenging for ArcGIS (any GIS approaches) to practically exclude 3D objects and technically convert into 'meaningful�?? DEM, in particular, in urban areas. However, if your DSM is referred to the data model in engineering/geomatics literature, which is constructed from 0.8-m optical data (stereo-pair imagery, or LiDAR cloud points), accurate 'bare' DEM (and/or 3D city model) can be automatically classified by advanced algorithms within remote sensing packages like Leica LPS or TerraScan, ... ... View more

....graphic card (Matrox M9148 LP PCIe x16) which supports 3D Vision Pro�?? & Open GL quad buffered stereo and has the ability to drive 3D to multiple displays/projectors. however, after add data into the ArcScene , nothing displayed in the data view and also pop out such warning:    �??Warning: Out of display memory ... Jack, When working with most projectors a VESA compliant stereo sync signal is mostly required for proper operation, for example, Projection Design F35AS3D. In addition, some graphic card is not reliable 'Multi-Display', even though it is called '3D Ready'... So, it is also advisable to create support remedy and directly to consult ESRI 3D team on the Matrox card. +++++ Pls send me your email via Private Message. ... View more

.... I'm not free to spent ~$10-$20K on other software, especially given that I am not using LiDAR-derived LAS pointclouds, and nothing works quite the same with SfM clouds. I have demo'd QT modeler and am in the process of demoing i-site studio, but haven't found an "ideal" tool yet. cloudcompare can handle 300-400 million points no problem but doesn't have editing tools. Lastools is useful but doesn't include a median filter. I am trying GRASS now as ArcMap chugs through generating stats on the multipoint I exported from Lidar. Would be nice if I didn't have to go through the step of exporting to multipoint though since arc now kind of natively supports lidar data. ....not clear if when I specify a cell size of 0.5 and a rectangular neighborhood of 1x1 if I am just analyzing the points in that cell, which is my goal (essentially like doing point-to-raster but allows me to calculate median). Andy, If you have to stay with ArcGIS (plus some of free packages) to minimize mess (noise) in LAS, it is also good to read the 3D blog at http://blogs.esri.com/esri/arcgis/2009/09/02/lidar-solutions-in-arcgis_part7-minimizing-noise-from-lidar-for-contouring-and-slope-analysis/ , which might be helpful somehow, (even a little older). Pls keep sharing your experience with us (saying, efficiency, accuracy improvement, etc.), if possible. Regards, ... View more

... figure out if ArcGIS is even worth working with to process my point data, or if I should look for another solution and just work with the finished rasters in Arc. I am generating 1.5 billion point clouds of a 30 km strip of river every few weeks. I chop the river into 5 chunks for processing. I have noise issues with specular reflection from the water (using SfM to generate pointclouds), so I have a mess where the water is. The best way to deal with the mess.. I think.. is to (1) clean up spikes with a median filter, and (2) eliminate areas of high noise/low returns with a combination of statistics. So ideally I would be able to generate a grid for each of the following in the .las file - mean, max, min, count, and stdev. My .las file stores everything as 1st (or last) return (I forget), and basically only has xyzrgb for each point. I tried to convert a <300 million point cloud to multipoint (actually I am still trying and it's been hours), but I am wondering if I should give up. I can get just about everything (except median, which is actually really important) from lastools, and I think I'll be able to get median, and maybe everything, with GRASS. I'd love to use ArcMap, but I am at a loss where to even start. .las file is 8GB. Andy, Certainly, ArcGIS 10.x can be used for some LAS tasks, in particular, as an integrated platform. So, it is better to read http://resources.arcgis.com/en/help/main/10.2/index.html#//015w00000069000000 to judge if it meets your needs�?� ++++++++++ Personally, as LAS practitioners in operation to deal with massive/ RAW LAS dataset for �??complete�?? LAS solution frequently (including LAS processing and DEM/city model extraction), it is worth for corporate organizations to invest time/money onto other vendors�?? LAS solution, like ERDAS/ ENVI/ Leica (XPro) or TerraScan. ... View more

.... Wondering if anyone has successfully used the "ESRI World Imagery" map service with the ENVI ArcGIS toolbox?   Hoping to run classified and unclassified analysis on imagery in Europe, and the World Imagery service has quite a bit of High res imagery.   ... Jay, Within ENVI 5.0 /SP3 (ENVI GP tools in ArcGIS 10.x), it is not available to access image services /bands for further image processing... +++++++++++ However, with the coming release of ENVI (ENVI Service Engine & ENVI for ArcGIS Server), it might be potential to work with image service from ArcGIS image server, somehow. (But, still doubt if it will work on cached �??ESRI World Imagery�??.�?�) ... View more

.... one computer and two projectors.... should we set this configuration in ArcScene or in those projectors? Jack, Better to check if the graphic card in your machine is 3D-ready (�??3D Vision Pro�?? & Open GL quad buffered stereo supported), and also has the ability to drive 3D to 3 displays/ projectors. ... View more

....  ArcScene will allow 3D view in a stereo viewing mode that works with multiple output displays. It states "Under Stereo view preferences, click the Method drop-down arrow and click Free. The view mode changes so left and right views of the scene are placed side by side. You can send each view to independent projectors for display on a screen and view the image for a stereo effect."   ... do not know how to send the L image to one projector and the R image to another projector.   Any ideas? ... Jack, Good idea to divide your Q into two parts: [INDENT] Stereo view in ArcScene (what is different from other stereo-pair view in photogrammetry); How to implement left and right images to independent projectors; [/INDENT] ArcScene provides 3 modes to view 3D scene /layers, including Perspective, 2D and Stereo View. As we know, if our data are in 3D models like multipatch or DEM, we can easily and commonly view this 3D scene in Perspective mode (attachment # middle). [INDENT]However, many data layers in ArcScene are not in 3D models, including 2D images and 2D vector. Mostly, those 2D layers in ArcScene are only draped onto terrain, if DEM available. In fact, ArcScene is not able to handle very-high-resolution (0.2~1m, even 10-m for larger scene) DEM very well â?¦ Very commonly, we have to consider other view model like Stereo view, in particular, when DEM not available. [/INDENT] So, Stereo View in ArcScene should be refereed to â??oneâ?? specific 2D data layer (even 3D scene, 3D model), which ensure users to view and see the 'depth' to that data with stereo-glass, i.e., â??mimicâ?? stereo mode, which give users feeling like stereo pair. In other word, without stereo-glass, you will see something like attachments #first & third... [INDENT]When viewing stereo-pair images in photogrammetry (saying, ERDAS Stereo Analyst), you can truly view in Anaglyph or parallel windows, which can be configured in separate window or projector for a pair of data.[/INDENT] [INDENT]On my understanding on ArcScene, Stereo View (Free) doesn't handle real stereo-pair data (or a pair of data like airphoto & GeoEye) in separate window/projector. [/INDENT] For the second Q, if two projectors are available, not hard to setup, as long as Stereo Free available (attachment #1). Regards, ... View more