#arcpy

[geographicbook]

Introduction to ArcPy for Geospatial Analysis

Getting Started with ArcPy ArcPy is a Python site package that provides a useful and productive way to perform geographic data analysis, data conversion, data management, and map automation with Python. It is a powerful tool that allows GIS professionals and programmers from many different disciplines to access and work with geographic data. What is ArcPy? ArcPy is a Python site package used…

[scoobydoodean]

But also IF I am around all day long and you can tell I won't get tf off Tumblr you should be looking at me like this to shame me as if I were Dean Winchester eating a whole pint of ice cream and you were Sam telling me I am going to get killed by a werewolf because I can no longer run fast enough to escape.

I need to do soooo much actual work so if I am not around as much in the coming weeks that is why.

[satyaranjan7605]

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[geone-ws]

Locked by another application using ArcPy and a File geodatabase

https://www.esri.com/arcgis-blog/products/arcgis-pro/data-management/locked-by-another-application-using-arcpy-and-a-file-geodatabase/

[the-joking-nerd248]

HAHAHAHHAHA, so τru bestie, I feel a deep and un ending malice tward the arcpy library when it comes to symbology,

ArcGIS is a program that exists to drive STEM majors into eldritch madness.

[spatialtech]

Which is better? ArcPy Calculate Field or Update Cursor? 

When concatenating field values, Update Cursor was almost 2x faster than Calculate Field!

Test was done on a feature class with 400K records. When done on a feature class with 100K records, Calculate Field took around 6 seconds and Update Cursor took around 3 seconds.

YMMV with more complex functions.

[technoinuniverse-blog]

Knowledge Is Power! Learn about  ArcGIS Pro & Flourish your Knowledge & Become GIS Specialist.

Learn more :- http://bit.ly/2lu6oEa

[many-leaves-on-the-trees]

I was like, oh I’ll write a bit of Python code that integrates through some image files and also iterates through some polygons for clipping purposes. There’s already a purpose-built set of commands to do this stuff! It’ll be easy and I won’t have to do it manually!

Three days later (5 if you count the times I spent on the weekend writing the skeleton of it but couldn’t test it): alright we’re iterating through the polygons and getting their centroids, we’re matching locations with the image files, we’re selecting one polygon at a time with a SQL query, but why is the clip feature not working???

[kunalverma2000-blog]

MARS CRATERS STUDY

After reviewing the materials . I have decided that I am interested in physical characteristics of the craters, specifically the diameter (DIAM_CIRCLE_IMAGE) and depth (DEPTH_RIMFLOOR_TOPOG). While the morphology category data (MORPHOLOGY_EJECTA_1 through 3) is interesting too. 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. I have decided to restrict my personal codebook to the following variables taken from the list in the Mars Crater Codebook –

 SPECIFIC TOPIC OF INTEREST

- Is there an association between the width of the crater and the depth of the rim of the crater?

 CODE BOOK

 1. CRATER_ID :Crater ID for internal use, in light of the rigion of the planet (1/16ths), the "pass" under which the crater was recognized, and the request where in it was distinguished.

 2. LATITUDE_CIRCLE_IMAGE: Latitude from the derived center of a non-linear least-squares circle fit to the vertices selected to manually identify the crater rim (units are decimal degrees North).

3. LONGITUDE_CIRCLE_IMAGE: Longitude from the derived center of a non-linear least-squares circle fit to the vertices selected to manually identify the crater rim (units are decimal degrees East).

4. DIAM_CIRCLE_IMAGE: Diameter from a non-linear least-squares circle fit to the vertices selected to manually identify the crater rim (units are km).

5.  DEPTH_RIMFLOOR_TOPOG: Average elevation of each of the manually determined N points along (or inside) the crater rim (units are km).

o Depth Rim –‐ Points are selected as relative topographic highs under the assumption they are the least eroded so most original points along the rim.

o Depth Floor – Points were chosen as the lowest elevation that did not include visible embedded craters.

MORPHOLOGY_EJECTA_1: ejecta morphology classified.

MORPHOLOGY_EJECTA_2: the morphology of the layer(s) itself/themselves.

MORPHOLOGY_EJECTA_3: overall texture and/pr shape of some of the layer(s)/ejecta that are generally unique and deserve separate morphological classification.

 SECOND TOPIC TO EXPLOREASSOCIATION WITH ORIGINAL TOPIC

Is there an association between the width of the crater and the depth of the floor of the crater? In other words, is the depth of the floor of the crater dependent upon the diameter of the crater?

 SOME BASIC QUESTION ASSOCIATION WITH SECOND TOPIC

Additional questions to be investigated in this study include the following:

- Is there an association/relation between the area of craters (based on its latitude & longitude) and the number of craters?Is there grouping of craters or there is the distribution of craters normally distributed?

- Is there an association/relation between the width of the crater and the number of ejecta layers?

 I will concentrate on whether there is a relationship between crater diameter and depth  in kilometers. As a stretch objective, I will determine if there is a secondary association between the noted characterstics and the crater location. The last may not be conceivable in the accessible time. While there are a few Python libraries that handle area information — models incorporate GeographicLib, GeoPandas, and ArcPy — these libraries may require some acclimation to deal with the coordinate system specific to mars to Mars.

 Based on the literature review (below) my hypothesis is:

As rim slope is somewhat related to crater depth so 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.

H1: It is theorized that there is a correlation between the diameter of a crater and the depth of a crater.

H0: Given a random sample set of craters, the depth of a crater on Mars is not dependent upon the diameter width of the crater when assessed at the 95% confidence level.

 LITRECTURE REVIEW(REFRENCES)

Data source: Google Scholar

Data Queries: cratering on mars, Mars Cratering depth, Mars Cratering size

Synopsis and literature review findings: There are many papers referencing cratering on Mars as well as a comparison of Mars cratering to Lunar cratering. Barlow, Hartmann, and Ivanov seem to be primary sources. Topics referenced focus on surface properties of craters such as diameter, location, and morphology.

Robbins, S. J. (2011), Planetary Surface Properties, Cratering Physics, and the Volcanic History of Mars from a New Global Martian Crater Database., Site: Stuart Robbins, Astro/Geophysicist on the Web, 1–239, address: http://about.sjrdesign.net/files/thesis/RobbinsThesis_LargeMB.pdf, codebook: https://d396qusza40orc.cloudfront.net/phoenixassets/data-management-visualization/Mars%20Crater%20Codebook.pdf, data set: https://d18ky98rnyall9.cloudfront.net/_b190b54e08fd8a7020b9f120015c2dab_marscrater_pds.csv?Expires=1505865600&Signature=hlpupZ1s7N3Wxc8zZTdoN5U7M6WZK~ogycatsSlGxj45JJg2eDW6xlGUl-DTSFWzjPBZOn3QSFHnZHsQnSrjKowRM7OZgctqX1iY4iTJV7pYKqXRhnBeDFJHwaLywKHLzlbK8bi5CKE5jX~xHxXfE~sGIzuOE4l1fnWliaoXAXA_&Key-Pair-Id=APKAJLTNE6QMUY6HBC5A

Barlow, N. G. (1988). Crater size-frequency distributions and a revised Martian relative chronology. Icarus, 75(2), 285-305.

Barlow, N. G., & Bradley, T. L. (1990). Martian impact craters: Correlations of ejecta and interior morphologies with diameter, latitude, and terrain. Icarus, 87(1), 156-179.

Barlow, N. G., Boyce, J. M., Costard, F. M., Craddock, R. A., Garvin, J. B., Sakimoto, S. E., … & Soderblom, L. A. (2000). Standardizing the nomenclature of Martian impact crater ejecta morphologies. Journal of Geophysical Research, 105(E11), 26-733.

Chapman, C. R. (1974). Cratering on Mars I. Cratering and obliteration history. Icarus, 22(3), 272-291.

Hartmann, W. K. (1966). Martian cratering. Icarus, 5(1), 565-576.

Hartmann, W. K., & Neukum, G. (2001). Cratering chronology and the evolution of Mars. In Chronology and evolution of Mars (pp. 165-194). Springer Netherlands.

Ivanov, B. A. (2001). Mars/Moon cratering rate ratio estimates. In Chronology and evolution of Mars (p

McEwen, A. S. (2003, July). Secondary cratering on Mars: Implications for age dating and surface properties. In Sixth International Conference on Mars (Vol. 1, p. 3268).

Nimmo, F., & Gilmore, M. S. (2001). Constraints on the depth of magnetized crust on Mars from impact craters. Journal of Geophysical Research: Planets, 106(E6), 12315-12323.

Werner, S. C., Ivanov, B. A., & Neukum, G. (2009). Theoretical analysis of secondary cratering on Mars and an image-based study on the Cerberus Plains. Icarus, 200(2), 406-417.

Aharonson, O., M. T. Zuber, and D. H. Rothman (2001), Statistics of Mars’ topography from the Mars Orbiter Laser Altimeter: Slopes, correlations, and physical Models, J. Geophys. Res., 106(E10), 23723–23735, doi:10.1029/2000JE001403.

The Martian impact cratering record, Strom, Robert G.; Croft, Steven K.; Barlow, Nadine G.

Martian cratering II: Asteroid impact history, William K. Hartmann

Cratering Chronology and the Evolution of Mars, William K. Hartmann; Gerhard Neukum

[iamcodegeek]

Python AddIns for ArcMap made easy using ArcPy ☞ http://learnstartup.net/p/SkphRZgdg #developer #coder #programmer H11g4hq9X04

[wingfield-since1995]

ポリゴン フィーチャでクリップしたラスター レイヤーのセル最大値と最小値を取得

久しぶりに ArcPy の操作。ポリゴン フィーチャでクリップしたラスター レイヤーのセル最大値と最小値を取得。

久しぶりに GIS らしい処理を ArcPy で実行したのでメモ。これから ArcGIS Pro で処理できる場合は可能な限り ArcGIS Pro の ArcPy で実行するようにしていきます。

今回は、大きな範囲のラスター レイヤーの中にポリゴン フィーチャがいくつか存在し、各ポリゴン フィーチャの範囲内でセルの最大値・最小値を取得するというものです。

[python title=”Python”] import arcpy

#以下を ArcGIS Pro の Python ウィンドウに貼り付けて実行

arcpy.env.addOutputsToMap = False #レイヤー追加を禁止

aprx = arcpy.mp.ArcGISProject("CURRENT") #現在のプロジェクトを取得 map = aprx.listMaps()[0] #最初のマップを取得

layer_t…

[iamprogrammerz]

Python AddIns for ArcMap made easy using ArcPy ☞ http://learnstartup.net/p/SkphRZgdg #developer #coder #programmer B11NYyVFM24

[monde-geospatial]

19 – Generating the Shapefile with Arcpy – Arcgis Scripting with Python 19 - Generating the Shapefile with Arcpy - Arcgis Scripting with Python

[iamadevelopers]

Learn the essentials of Python and ArcGIS's arcpy ☞ http://go.thegeeknews.net/d6b0af9220 #python #programming

[technoinuniverse-blog]

Sprint your career! Getting Started with ArcGIS Pro & Get the Opportunities in GIS Tracks and become certified GIS analytic.

Learn more :- http://bit.ly/2HjU8hv