Latest Contributions by PeterBecker

‎07-02-2018

Image Filter is part of Web Map Viewer in ArcGIS Online. Was added a few months ago, but latest version work better with Sentinel 2. Add Sentinel-2 Views Click on Filter Press on 'Remove Filter' - This removes a filter that limits the display only to latest dates. Click on 3 dots and select Image Filter Now you can set filters to any range you want, see key attributes of the image and add the layers to your map

‎06-29-2018

Enrico, You have a good point. There are advantages and disadvantages of making the layers time aware. The issue has been that when time aware some app default to the earliest time and this does not work well for such services. Also the standard time line tools are not very effective at working with images with such disparate times. Hence the suggestion to use the time selector tools. Note there is now a image/time selector in the WebMap Viewer as well as in Pro and using Web Apps (see WABIS) and the new Imagery Configuration templates. The Sentinel service is currently Beta status we will look to possibly change the setting to time enabled (but keep default as off) for the release which should happen relatively soon. I'll add your name to the 'enable time' vote.

‎06-09-2018

3857 is equivalent to Web Mercator Auxiliary Sphere which is a projection based on WGS84 datum. 4326 defines that the data is non projected but defined in Long,Lat values also based on WGS84 datum. When you create a mosaic dataset you define the projection for the mosaic dataset. The source data can be in different projections and the requests can be in different datums. The system will transform the data from the source to the requested projection. This on the fly projection is very fast and add very limited overhead. The projection of the mosaic dataset has no effect on the performance. The slight loss of performance is due to the reprojection from the source data to that requested by the client application. The projection of the mosaic dataset is not very important so long as the data can fit in the bounds of the projection. Unless your are working on areas near the poles, I typically recommend users use Web Mercator Auxiliary Sphere for the mosaic dataset, unless the vast majority of your data is in another projection. The one disadvantage of using 4326 is the pixels sizes (which define scale) are in fractions of a degree (vs meters) which can be more difficult for user to understand. When you add an image service to a map in desktop it will be projected to the current map projection. Similar in most web applications the data will be projected to Web Mercator Auxiliary Sphere, unless the basemap of the webmap is different. In the above you also refer to your LandCover dataset which has a Sinusoidal projection, but does not have a Datum defined. This should be checked. It is likely that the scale is so small that it make no difference. If undefined ArcGIS will assume it is in the same datum as the client is requesting. Just be aware that you have not defined a datum. If a datum is defined then then the transformation between the datum is also handled as part of the reprojection. I would recommend against re-projecting this data to a more optimum projection as this would add re-projection artifacts. If added to the mosaic dataset then users can access in any projection. Changing the client to the same projection would reduce any reprojection artifacts. Also note that a property set by the image service client is the type of resampling to be performed when reprojecting.

‎02-27-2018

We have not heard this as an issue. Can you provide more information. Can you check that the mosaic datasets (or individual rasters datasets) open up correctly in ArcGIS Desktop.When you say they are not displaying at all, can you confirm if the services appear in the service directory or not. If you publish a previous mosaic dataset can you check the Analyzer provided as part of the image service publishing states. Are you publishing to Image Server or are you publishing to ArcGIS Enterprise?

‎02-09-2018

See Aerial Photo Mosaics | The Long Term Archive

‎02-08-2018

A photo index is a map that was typically created by the organization that originally flew the imagery that provided an overview of where the images were taken. You have to think back to what was available in the 1940's to create such an overview map. There were two main ways to create this. A) The navigator that flew the mission or someone else with knowledge of the area would mark on a map the approx location of each image or the first an last image of a run onto an existing map. B) A print laydown would be produced, which is really an analog mosaic of contact prints that was then photographed and some coordinates etc added. These Photo Indexes are typically kept with the films and the provider of the scanned images may be able to provide the photo index. The photo index is then typically scanned, georeferenced and digitized. The result of this process is a point feature class (or SHP file) that provide the approximate location of each photo center. These PhotoIndex files are used to initialize the creation of mosaic datasets which are the first stage in the process of georeferencing large collections of such imagery. Note that if you want to manually georeference the images this capability is also available in ArcGIS. For some image one you have an approx location you can use the autogreoreferencing feature to automatically control points between the image to be georeferenced and an image base (such as world Imagery of other georeferenced image). Especially with old imagery finding such control can be difficult an it it advised to use the OrthoMapping capabilities available with ArcGIS desktop advanced.

‎01-19-2018

These tools include an 'Area of Interest' parameter that can take as input a geometry (eg the boundary of a mosaic dataset) and ensure that only the tiles intersecting these are cached. The tool does not use this to in the size estimation. I would recommend you test with a smaller areas first. Also consider using 10.6 which has a number of enhancements for in the caching tools.

‎01-12-2018

I'd suggest in Define overview you do the following: Set PS to one of the following: 0.25,0.5,1,2,4,9,19,38,75,150,300,600,1200,2400,4800,9600,19200,38400,77800,153600, These are scales that are similar but slightly better then those used in most web application. The appropriate value to use will depend the resolution of the source data and existence of pyramids and size of the source data images. If creating from the source data and assuming the data has pyramids you can use value closest to width of source data (m) / 1000 would be an estimate. If you have already created source mosaic datasets that have their own overviews then set to width of smallest source mosaic dataset extent/1000. Set OverviewSampling factor to 2. (I nearly always recommend this be set to 2 not the default 3) Set JPEG quality to 85. Give this a try and see if it helps.

‎12-18-2017

Please correct link. "This bug does not exist"

‎12-18-2017

I have not been able to reproduce this. Can you clarify what version of desktop you are using to edit the mosaic dataset. If you set 'Always clip raster to footprint' to Yes and then edit the footprints, does this work and not turn to bw. I noticed the image are scanned maps. Can you confirm if these are 3band images or are they 1ban 8bit with a color map. I'm trying to determine if the colormap for the images got lost

‎06-13-2016

Depends on the client and the layers that have been defined. In Desktop it will resample the image and display imagery if the layer has not been defined. In web it will display blank. One alternative is to serve as an image service and turn on demand caching one. Then the server will generate the additional tiles if required.

‎06-13-2016

Use 'Manage Tile Cache'. This enables you to defined not only the scales at which the imagery should be created but also Area of Interest. Run the tool twice once for the 'blue' area at the lower resolution and then again with the same cache but define AOIs for the 'red' areas. For the second time just define the higher resolution scales. You do not need to create two separate mosaic datasets. The mosaic dataset can easily contain multiple resolutions and you can define which has the higher priority at different scales. Note if you have already generated the tiles (using same tiling scheme) you can then use 'Import Tile Cache' to merge the two caches.

‎05-25-2016

Also check out the following Blog post about Colormaps Can I create a customized colormap file in ArcGIS? | ArcGIS Blog

‎05-25-2016

There is a known issue with CLR files with negative values (not being used), but this does not look like the issue you are having. Can you provide some more details on the version of ArcGIS you are using. Also can you provide a sample of the CLR file you are using.

‎05-04-2016

Mody Typically if you get a set of rasters that have been previously enhanced you do not want additional enhancements being made on each individual image. You might want to just do some enhancement to the mosaiked image to make it say lighter or darker. When adding raster datasets to a mosaic dataset you will see in the 'Raster Type/Properties/General' that the processing type is 'Default'. If you check the 'Functions' tab you will see that Default does nothing. There is though a 'Stretch' option and in the function tab you can define the type of stretch to apply. By default this is set based on the stats of the dataset. You could use this if you the image that you get have not been enhanced and you want each image to be enhanced based on its statistics. You can also set it to Dynamic Range Adjustment in which case it will apply different enhancements to each individual image before mosaicking the images together, based on the pixels that contribute to the current display.. This is an interesting option if you have imagery that varies significantly and you want each image to be individually enhanced. It can result in some strange results though especially if you have clouds etc. So you can add such stretch (or other functions) when the data is added or as a post process using the Batch Edit Raster functions. If you want to just enhance the result add the stretch as a service level (IE after the mosaicking)

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My Ideas

Latest Contributions by PeterBecker

Re: Sentinel Imagery Time slider in AGOL /Web App Builder

Re: Sentinel Imagery Time slider in AGOL /Web App Builder

Re: image services

Re: image services not displaying after ArcServer upgrade

Re: What is PhotoIndex and what does it for and how do I use it ?

Re: What is PhotoIndex and what does it for and how do I use it ?

Re: Can a non-contiguous image service be safely cached?

Re: Overviews are Blurry for Derived Mosaic Dataset

Re: Rasters in mosaic dataset turn out black and white after footprint editing

Re: Rasters in mosaic dataset turn out black and white after footprint editing

Re: Creating image cache using imagery with different resolution (best practice)

Re: Creating image cache using imagery with different resolution (best practice)

Re: Colors not displaying in image service

Re: Colors not displaying in image service

Re: Rasters in mosaic looks different then the raster itself

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