Grid-based mapping: A method for rapidly determining the spatial distributions of small features over very large areas

Abstract

Citation for published item: msdleD tFhF nd flmeD wFF nd gonwyD FtF nd qllgherD gF nd vn qsseltD FeF nd ruerD iF nd yrgelD gF nd ¡ ejourn¡ eD eF nd kinnerD tFeF nd gostrdD pF nd tohnssonD eF nd vosikD eF nd eissD hF nd wirdD FwF nd uereszturoD eF nd mithD sFfF nd ltzD F @PHIUA 9qridEsed mpping X method for rpidly determining the sptil distriutions of smll fetures over very lrge resF9D lnetry nd spe sieneFD IRH F ppF RWETIF Further information on publisher's website: httpsXGGdoiForgGIHFIHITGjFpssFPHIUFHRFHHP Publisher's copyright statement: c 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Grid-based mapping: a method for rapidly determining the spatial distributions of small features over very large areas, Planetary and Space Science, http://dx. AbstractThe increased volume, spatial resolution, and areal coverage of high-resolution images of Mars over the past 15 years have led to an increased quantity and variety of small-scale landform identifications. Though many such landforms are too small to represent individually on regional-scale maps, determining their presence or absence across large areas helps form the observational basis for developing hypotheses on the geological nature and environmental history of a study area. The combination of improved spatial resolution and near-continuous coverage significantly increases the time required to analyse the data. This becomes problematic when attempting regional or global-scale studies of metre and decametre-scale landforms. Here, we describe an approach for mapping small features (from decimetre to kilometre scale) across large areas, formulated for a project to study the northern plains of Mars, and provide context on how this method was developed and how it can be implemented.Rather than "mapping" with points and polygons, grid-based mapping uses a "tick box" approach to efficiently record the locations of specific landforms (we use an example suite of glacial landforms; including viscous flow features, the latitude dependant mantle and polygonised ground). A grid of squares (e.g. 20 km by 20 km) is created over the mapping area. Then the basemap data are systematically examined, grid-square by grid-square at full resolution, in order to identify the landforms while recording the presence or absence of selected landforms in each grid-square to determine spatial distributions. The result is a series of grids recording the...

Grid-mapping Hellas Planitia, Mars – Insights into distribution, evolution and geomorphology of (Peri)-glacial, fluvial and lacustrine landforms in Mars' deepest basin

“…We decided to produce a 20 Â 20 km raster in order to (1) compare our results to the work done by Orgel et al, 2015;Ramsdale et al, 2017;S ejourn e et al, 2015; in Vastitas Borealis, as these studies used the same grid size, and (2) as this mesh size is adequate for such an extensive study area. To ensure that our work is consistent and uniform only one mapper, the main author of this text, has executed the grid mapping in Hellas.…”

“…Because of its vast size and its high geographical diversity, we have applied the newly developed grid-mapping method (Ramsdale et al, 2017) in an ArcGIS-environment to contextualize the inventory of landforms and the landscape characteristics such as elevation, slope, and aspect. This enabled quantifying the presence of selected landforms with respect to their geographic distribution.…”

“…This enabled quantifying the presence of selected landforms with respect to their geographic distribution. Grid mapping has already been applied successfully in the northern Martian lowlands (Brooker et al, 2015;Orgel et al, 2015;Ramsdale et al, 2017;S ejourn e et al, 2015;. In contrast, Hellas Planitia, located on the opposite hemisphere, complements the work of mid-latitudinal and low-elevated landforms on Mars.…”

Grid Mapping the Northern Plains of Mars: Using Morphotype and Distribution of Ice‐Related Landforms to Understand Multiple Ice‐Rich Deposits in Utopia Planitia

“…A project of strategic, targeted mapping of water‐ or ice‐related surface landforms was therefore undertaken to understand the geological and stratigraphic character of the Martian northern plains, with particular regard to the role that ground ice has played in their evolutionary history. We used a grid mapping approach (e.g., Ramsdale et al, ) with the latest middle‐ to high‐resolution images of Mars to study its northern large basins (Arcadia, Acidalia, and Utopia Planitiae). The aims were to compare and to contrast the assemblages of landforms and their latitudinal distribution across these three regions and to attempt to determine the origin of some of these materials (Orgel et al, ; Ramsdale et al, ).…”

“…The aims were to compare and to contrast the assemblages of landforms and their latitudinal distribution across these three regions and to attempt to determine the origin of some of these materials (Orgel et al, ; Ramsdale et al, ). Grid mapping is an efficient method to deal with the problems of mapping small landforms over large areas by providing a consistent and standardized approach to spatial data collection (Ramsdale et al, ; Voelker et al, ).…”