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#1 aecomm

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Posted 01 December 2016 - 06:15 PM

Hello, 

 

I am trying to determine the size of features in a particular MSL Curiosity image, and I'm unsure how to do this. Ultimately, I would like to use the photo, with a scale bar, in a comparison to a terrestrial feature. 

 

I have looked over the PDS Label, but am unsure what to do with the information. 

 

Any help would be greatly appreciated. 

 

 



#2 Tom Stein

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Posted 01 December 2016 - 07:20 PM

Hi there. If you are looking at a Hazcam or Navcam image that is part of a stereo pair, you can use the Notebook's Image Viewer. There are measurement tools built in to let you obtain locations and distances and to view elevation profiles.The tool is a little hard to find--we recently started work on some tutorials to help users like yourself find these tools and learn how to use them, but they still are in production. In the meantime, let me briefly walk you through getting to and using the Image Viewer measurement tools.

 
To get started in this example (a Navcam stereo pair from sol 1292), click on this link: http://an.rsl.wustl.edu/su/y6Y8N

 

Side note, explanation of how I got to this page in the Notebook: Open the Analyst's Notebook for MSL and go to the Sol Summaries (the orange "sun" icon). This shows the data, documents, etc for each sol. If you click on a sol to expand it, you then have an option to expand the Data Products list for that sol. Clicking on any product in the list brings up a window about that product or group of products.

 

Your screen should look something like screen shot 1. On the left is the sol summary list, and on the right is a Navcam stereo pair (and the resulting anaglyph image). We will work with the left image. The shortest was to get to the Image Viewer for that image is to click on the menu button where the red arrow is pointing in screen shot 1.

 

A menu should open and your screen should look like screen shot 2. Now click on the Image Viewer link (in the red box in the screen shot 2). You should now see something like screen shot 3.

 

Depending on your screen size, the Image Viewer space may be pretty small. You can get more area to work with by clicking on the two buttons highlighted in screen shot 3.

 

In the Image Viewer, there is a left side with some controls, and the right side with the image. At the start, you are assigned the Pointer tool. Switch to the Distance Tool by clicking on the ruler icon highlighted in screen shot 4. A few things will happen. 1. The Distance tool icon will be highlighted in yellow to show it is selected. 2. Directions will appear (circled in red on screen shot 4) to show how to use the tool. 3. A purple overlay mask will appear to show where there are XYZ data in the image (purple is out of bounds).

 

In this example I will create a distance using by following the instructions above the image: left click at the starting point, left click again where I want it to end, and then click the Complete button in the instructions. My screen looks like screen shot 5. There is an entry in the Distance table on the left. When I click on that like (in the red box in screen shot 5), the I have the opportunity to change the settings. I chose to increase the label size so it would be a little bigger.

 

Note that you can export the image by selecting File > Download annotated image in the Image Viewer menu.

 

Also, if you sign in with an account, your measurements will be saved and are loaded automatically the next time you open the image in the Image Viewer, even on another computer.

 

There is additional Image Viewer help at this Notebook help page.

 



#3 aecomm

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Posted 12 December 2016 - 02:20 PM

Wow, Brilliant! Thank you so much for the tutorial. I'll make sure to disseminate the information to my lab group.

 

Follow-up: I'm using a mastcam image (http://an.rsl.wustl.edu/su/Ci4o7W5Dbd) and have the same question: In the absence of the measurement tool capability, do you have a workflow or information page I can refer to so as to determine the scale and orientation of the image? 

 

Thanks for all your help!



#4 Tom Stein

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Posted 16 December 2016 - 11:33 AM

Glad to hear the tutorial helped. Although not trivial, you can use the Mastcam SIS (Software Interface Specification) in conjunction with individual product labels to work out the pointing information. The scale is a bit tougher. We are working on adding image footprints to the traverse map to show orientation. We will also consider adding pointing information to the product overview page to at least provide basic information about where the image is relative to the rover.

 

The Mastcam SIS is available here: http://an.rsl.wustl.edu/su/t8F4Tcw3

Note that this link may change as documents are updated. I found the document from the Resources tab under "Mission and instrument data set documents" and then choosing "Mastcam".






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