topic Re: Aerial Images in ArcGIS Spatial Analyst Questions

Aerial Images

JessiecarEsguerra — Sun, 01 Mar 2015 07:59:21 GMT

What are the things to consider when processing Aerial Images to ensure that the result are correct? I need to combine thousands of Aerial Images into one. I have ArcGIS Desktop 10.2 to do this. Any tips and suggestions are highly appreciated. Thanks in advance.

Re: Aerial Images

JessiecarEsguerra — Fri, 06 Mar 2015 18:15:33 GMT

Hello GIS Users, any suggestions please! Thanks!

Re: Aerial Images

IanMurray — Fri, 06 Mar 2015 18:22:03 GMT

Your initial question was somewhat vague. Are you needing to mosaic multiple images together? run image analysis on images? Are they already Georeferenced or do they need georeferencing?

If you could be a bit more specific about the project you are needing to do, it would help us find an answer.

Re: Aerial Images

JessiecarEsguerra — Fri, 06 Mar 2015 18:35:26 GMT

I already have georeferenced aerial images and i need to mosaic those multiple images. I know the process of mosaicking using raster catalog but I am uncertain as to how i could verify that the position of said images are correct.

Thanks for answering Ian.

Re: Aerial Images

DEAF_PROBERT_68 — Sat, 07 Mar 2015 16:41:28 GMT

Hi friend,

Have you consider using Mosaic Dataset ? I'd start working with two first and then add two more to give you an idea.

More information can be found here :ArcGIS Help 10.1

I just worked on this with NAIP I am working on for the whole state of New Mexico 2009, 2011,2012, and 2014.

Re: Aerial Images

JessiecarEsguerra — Mon, 09 Mar 2015 03:38:30 GMT

Hi Robert,

Thanks for spending time in joining this discussion.

To answer your question, Yes, have tried both, raster catalog and mosaic dataset and working a few images, it looks good but my worry is that once I have added thousands of images to the raster catalog/mosaic dataset, how could I verify that every single images are in the right position. Is there a way to validate multiple images at once? Thanks again.

Re: Aerial Images

DEAF_PROBERT_68 — Mon, 09 Mar 2015 03:58:17 GMT

Before I ask you further, how many aerial images and what will you be using them for ?

Re: Aerial Images

JessiecarEsguerra — Mon, 09 Mar 2015 04:04:12 GMT

I am uncertain yet with the exact number of aerial images but definitely I will have a thousands of images since it will be covering different States. I need to have an image service for a web application.

Re: Aerial Images

DEAF_PROBERT_68 — Mon, 09 Mar 2015 04:08:41 GMT

You should be able to use this method... might want to look at here

Image Management Workflows | ArcGIS Resource Center

Honestly, it is an awkward workflow but I had to work on it for many hours until I understand how it works...

Like I said I did work on NAIP for New Mexico and i was able to get it right..it took me to figure it out about three days... I have asked others here on the GeoNet and only few people repsond me back...

Do you have background in Erdas or Envi ?

Re: Aerial Images

JessiecarEsguerra — Mon, 09 Mar 2015 04:26:33 GMT

Unfortunately, No.

Honestly speaking, I'm not familiar in Erdas or Envi.

I'll take a look on Image Management Workflows | ArcGIS Resource Center

and see if I could understand this one and if this will work on me.

I have actually tried "Project Raster Tool" in ArcToolBox and also changing the spatial reference by right clicking the rater catalog in the ArcMap Catalog window > Properties > XY Coordinate system tab. Unfortunately, both didn't work as how I wanted it. Images is going in different place but never fall in the right location.

Thank you so much Robert. I really appreciate your inputs and would be very glad to hear more about this concern if you find anything else that might help me resolve this issue. Thanks!

Re: Aerial Images

KishorGhatage — Mon, 09 Mar 2015 05:37:07 GMT

If you are creating a mosaic dataset or raster catalog from tiled raster data, such as orthophotos or the USGS topographic maps, it is recommended that you use the same projection for the mosaic dataset or raster catalog as the stored data is using. If that's not possible because of a mix of projections, try to use a projection based on the same datum. For example, the USGS topographic maps were originally created using NAD27. For more information please follow the link below:

ArcGIS Help 10.1

Once you create a mosaic, you can add it on top of ESRI Basemap or Bing Map in ArcMap and have random checks. You can use Swipe tool on Effect toolbar bar.

Hope this is helpful

Regards

Kishor

Re: Aerial Images

JessiecarEsguerra — Mon, 09 Mar 2015 05:58:56 GMT

Thank you for the information Kishor.

I am currently looking and reviewing on a topographic maps for HI and creating mosaic dataset or a raster catalog, the images is still misaligned. The mosaic dataset and/or raster catalog that I am recreating should be using "WGS 1984 Web Mercator (auxilliary sphere)" and the maps that I have are mostly in "Old Hawaiian". I'm seeing some issues about this projection in forums but I can't figure out how can I correct this or what should I do to correct this to fit in accordingly in the basemap. The Spatial Reference as I've checked on the properties are "Polyconic" and/or "Transverse Mercator".

Re: Aerial Images

DEAF_PROBERT_68 — Mon, 09 Mar 2015 15:11:56 GMT

I am not sure if you are aware that there is another good site for you to read...

it is called GIS Stackexchange where everyone share their GIS problems.

I looked it up for your similiar situation and found a lot of good information...

The website is Geographic Information Systems Stack Exchange

Type Mosaic Dataset

Good luck.

Re: Aerial Images

JessiecarEsguerra — Wed, 11 Mar 2015 02:36:16 GMT

Thank you so much Robert.

I'll try that website and look for possible solution on my problem.