Introduction to THEMIS ISRO-NASA Mars Data Analysis Meeting February 22-25, 2016 Bengaluru, India

TH ermal EM ission I maging S ystem 2

THEMIS Detectors 3

THEMIS Day IR * = nominal value Resolution: 100 m/pixel * Image Size: 32km x ??km Bands: 10 * Wavelengths: 6.78 – μm Summing Factors: 1, 2, 4, ….. Imager Type: Pushbroom 4

THEMIS Night IR Resolution: 100 m/pixel * Image Size: 32km x ??km Bands: 10 (3*) Wavelengths: 6.78 – μm Summing Factors: 1, 2, 4, ….. Imager Type: Pushbroom 5 * = nominal value

THEMIS VIS Resolution: 18 m/pixel * Image Size: 18.4km x ~52km * Bands: 5 (1*) Wavelengths: μm Summing Factors: 1*, 2, 4 Imager Type: Framing 6 * = nominal value

THEMIS Color VIS - 1 Resolution: 36 m/pixel * Image Size: 18.4km x ~52km * Bands: 4* Wavelengths: μm Summing Factors: 2* Imager Type: Framing 7 * = nominal value

THEMIS Color VIS - 2 Resolution: 72 m/pixel * Image Size: 18.4km x ~435km * Bands: 2* Wavelengths: μm Summing Factors: 4* Imager Type: Framing 8 * = nominal value

Accessing THEMIS Data ISRO-NASA Mars Data Analysis Meeting February 22-25, 2016 Bengaluru, India

 Archived THEMIS data is available on NASA’s Planetary Data System  Go to:  Under “PDS Nodes”, choose “Geosciences”  Under “Geosciences Node Data”, choose “Mars”  Choose “2001 Mars Odyssey”  Choose “THEMIS” to access the THEMIS PDS webpage  Direct link:  To access the THEMIS data volumes, click “Direct links to THEMIS Data Volumes online at the THEMIS Data Node”  Direct link:  Camera coordinate data is located under “ODTSDP_v1”  Geographically registered data is located under “ODTGEO_v2” THEMIS Data on the PDS 10

THEMIS Data on the PDS 11

THEMIS Data on the PDS 12

THEMIS Data on the THEMIS Website  Many users find it easier to locate and access THEMIS data products using the search features on the THEMIS data webpage  Go to:  The “THEMIS” option will be selected by default  To search for data products from other instruments (CTX, HiRISE, etc) using the same search tools, select the instrument from the list along the top of the page  To search for THEMIS data products, either: 1.Enter an Image ID 2.Enter your search parameters 13

THEMIS Data on the THEMIS Website 14

THEMIS Data on the THEMIS Website 15

THEMIS Data in JMARS (1)  The THEMIS team recommends using JMARS to locate and access THEMIS data products  JMARS is an open source geospatial information system (GIS) developed by the Mars Space Flight Facility at Arizona State University  Registration and Install Guides:  JMARS Website:  Written and video Tutorials  Frequently Ask Questions (FAQ)  Help Forums  JMARS allows users to search for observations from most Mars instruments (including THEMIS) and view their footprints overlaid on global maps  Data can be loaded and displayed within JMARS for initial analysis  Provides links for downloading the data products 16

Viewing THEMIS Data in JMARS 17

THEMIS Data in JMARS (2)  Once in JMARS, users can search for THEMIS image footprints (stamps) by going to: “Add New Layer” -> Category=“Imagery”, “THEMIS”  Example Query:  Click “Set Lat/Lon Bounds to Main View”  will only search for footprints in the area currently displayed  Under “Image Type”, select “IR”  Under “Viewing Conditions” -> “Incidence Angle”, set the minimum value to “0” and maximum values to “90”  Will only search for daytime images  Under “Quality Parameters” -> “Image Rating”, set the minimum values to “7” and the maximum values to “7”  Will only search for highest quality images  Image ratings are only qualitative/subjective  Click “Okay” to submit the query 18

Viewing THEMIS Data in JMARS 19

Viewing THEMIS Data in JMARS 20

THEMIS Data in JMARS (3)  To render an image within JMARS:  Left-click on the footprint/stamp to select it  The outline will change to yellow  Right-click on the selected stamp -> “View THEMIS Stamps” -> Select the Image ID you want to view, the select image is at the top -> “Render Selected as BWS”  The browse image will be rendered in JMARS  Users can also render data products, such as:  PBT (project brightness temperature), which gives actual temperature values  D642,D875,D964 (decorrelation-stretched images using the three bands stated in the name) 21

Viewing THEMIS Data in JMARS 22

Viewing THEMIS Data in JMARS 23

Viewing THEMIS Data in JMARS 24

THEMIS Data in JMARS (4)  To view the summary webpage for an image:  Left-click on the footprint/stamp to select it  The outline will change to yellow  Right-click on the selected stamp -> “View THEMIS Stamps” -> Select the image ID you want to view (highlighted image is on top) -> “Web Browse”  Your web browser will open a summary page for the selected image  This is the same summary page users can access through the viewer.mars.asu.edu website  Basic data products are available for download on the right-hand side under “Data Products”  BWS (Browse), BTR (brightness temperature record”, etc  Higher level products (ex: PBT, projected brightness temperature) are available through the PDS  JMARS can be used to identify the image IDs of interest 25

Viewing THEMIS Data in JMARS 26

MDA Meeting THEMIS Slides THEMIS Websites

MDA Meeting MCS Slides