MARS IMAGE OBSERVATION SHEET
Yenra | https://yenra.com/mars-pictures/
Prepared October 13, 2026

Purpose: keep an image's source, visible evidence and interpretation together.
Use one sheet per image. Open the official image record before filling it in.
Mark absent information "not supplied"; keep release and observation dates separate.

RECORD
Image title and product identifier:
Official record URL:
Mission / spacecraft:
Instrument / camera:
Observation date and time (including time system if supplied):
Release or addition date:
Site / coordinates / north direction / viewpoint:
Image product (raw, calibrated, mosaic, projected, enhanced, other):
Original file name and version:
Credit and usage conditions:

SCALE
Scale or scene size from the record (include units):
Does that scale apply to this exact product?
Has the image been cropped or resized?
If size estimation is justified: pixels x metres per pixel = metres.
Hypothetical example: 200 pixels x 0.5 metres/pixel = 100 metres.
This example is not a measurement of Nirgal Vallis or any particular image.
Perspective views need geometry; do not assume one scale applies at all distances.

OBSERVATIONS (describe what you see before proposing causes)
1.
2.
3.

INTERPRETATION
What does the source caption or paper conclude?
Which observation supports that conclusion?
What alternatives or uncertainties does the source discuss?
My question or hypothesis (clearly distinguish this from the source):

COMPARISON, IF USED
Second image identifier and URL:
Are location, season, illumination, geometry and processing comparable?
Could an apparent change be caused by a different image product or lighting?

NEXT STEP
What additional observation or source would help?
Date I reviewed this record:

Worked source example:
PIA03756, Nirgal Vallis (Released 27 March 2002)
https://science.nasa.gov/photojournal/nirgal-vallis-released-27-march-2002/
The record describes a scene about 22 km wide and 60 km long, north at top.
Consult the full record; a release date is not automatically an acquisition date.
Credit: NASA/JPL/Arizona State University.