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Depth Floor: Points were chosen as the lowest elevation that did not include visible embedded craters.
After consideration, I have decided to use one of the existing choices.
It is a data set specific to a study of the craters of Mars in 2011, by Stuart James Robbins of the University of Colorado, Boulder.
As rim slope is somewhat related to crater depth, I can hypothesize that crater diameter and depth do have a direct correlation to each other.
The degree to which they are related remains unknown at this point until I begin analysis.
Mazarico (2011), A global catalog of large lunar crater (≥20 KM) from the Lunar Orbiter Laser Altimeter, This data includes a more complete assessment of the probable-to-certain impact basins on the surface of Mercury, as well as includes a number of additional craters, particularly in locations where the imaging from the MESSENGER flybys and Mariner 10 observations were not ideal for crater recognition.
This 3-D stereo image taken by the Mars Exploration Rover Spirit’s navigation camera shows the rover’s lander and, in the background, the surrounding martian terrain. Kreslavsky, Lunar Orientale Impact Basin Secondary Craters: Spatial Distribution, Size-Frequency Distribution and Estimation of Fragment Size, Journal of Geophysical Research, submitted. Head (2017), Evidence for stabilization of the ice-cemented cryosphere in earlier martian history: Implications for the current abundance of groundwater at depth on Mars, Icarus, 288, 120–147, doi:10.1016/j.icarus.20. Links to the study, codebook and data set are in the References section at the bottom of this post.After reviewing the materials, I have decided I am interested in physical characteristics of the craters, specifically diameter (DIAM_CIRCLE_IMAGE) and depth (DEPTH_RIMFLOOR_TOPOG).I have decided to restrict my personal codebook to the following variables taken from the list in the Mars Crater Codebook –a.Depth Rim: Points are selected as relative topographic highs under the assumption they are the least eroded so most original points along the rim.b.Summary We have covered the purpose for this initial post, including the selection of a data set, and determination of a research topic based on the data set.Additionally, we have determined the content of a personal codebook for the data set based on the topic scope, and formulation of a hypothesis for our research topic. Rothman (2001), Statistics of Mars’ topography from the Mars Orbiter Laser Altimeter: Slopes, correlations, and physical Models, J. Res., 106(E10), 23723–23735, doi:10.1029/2000JE001403. While the morphology category data (MORPHOLOGY_EJECTA_1 through 3) is interesting, this data is not available for most craters listed in the data set.Additionally, the available data on morphology may prove difficult to interpret based on my existing knowledge.