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Using spatial join in ArcGIS for Desktop?

Using spatial join in ArcGIS for Desktop?


I have two spatial layers of about the same (not exactly same) spatial extent. Layer#1 has about twice the number of polygons than layer#2 (in thousands).

I am trying to calculate values for Field#X and Field#Y present in layer#2 for layer#1 based on spatial location (using right click -> joins and relate, etc.).

What would be the best way to do it?

I am trying to do it using "join data from one layer based on spatial location" and then averaging. But once I sum up the total for Field#X and Field#Y for the resulting layer, it is a much different than the total for the same in the original layer (i.e. layer#2). It should be comparable as the spatial extents are about the same.

Any suggestions on how to address this?


That depends on the values you are attempting to calculate, and the relationship between the two layers boundaries (how coincident they are). Since it sounds like they're numeric values, a spatial join is probably not the way to go. Also note that the right-click join method doesn't give you full control over a spatial join as the GP tool does.

I'm not entirely clear on what you're trying to do from your description, but there are two concepts you need to know about - aggregation and apportioning. Aggregating means combining to larger, while apportioning means dividing between. We have tags for those, so if you search you'll get more info. In some cases you must first apportion before aggregating.

Say for example you have polygons A, B, C, D that all partially fall in polygons 1 and 2. You want to know the total of ABCD for each 1 and 2. First you would have to apportion ABCD to 1 and 2, then aggregate those results to get a total. If you're looking at a geometry property like area, a straight up overlay will do this. If you have a numeric attribute value, the apportioning is usually done by area (meaning percent area A1 of total area A times attribute value is assigned to A1).

A spatial join doesn't do this. It is considered an overlay operation, but it doesn't divide up the inputs at all. You either get one match (first record found) or multiple matches. There are any number of reasons why the join method would produce different totals than the inputs. There are three other overlay operations that could do what you want:

  • Intersect only returns areas of overlap (A and B)
  • Union returns all areas from both layers (A or B)
  • Identity will return all areas from one layer but cut up according to the other, but requires an Advanced license. (A, A and B, but not B)

The main choice is whether you care about the areas that don't overlap. And in ArcGIS, if you do need to apportion values, you will need to create feature layers, specify a ratio policy when creating said layers, and then run your overlay tool on those feature layers (see Apportion Neighborhood Information to Census Tracts for details).


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ArcGIS Pro 2.0 offers innovations, streamlined workflows

ArcGIS Pro 2.0, Esri’s next-generation desktop geographic information system (GIS), is now available. This latest version provides more highly requested workflows and features new innovations.

It is also more tightly integrated with the rest of the ArcGIS platform, so that users can complete more of their workflows solely in ArcGIS Pro.

Jack Dangermond, Esri president, introduced major features of the upgrade at the Esri User Conference plenary July 10. The Esri User Conference takes place in San Diego July 10-14. Several focused sessions at the conference will explore the updates to ArGIS Pro.

Highlights of ArcGIS Pro 2.0 include the following.

The user’s favorite workflows are now easier and more powerful in ArcGIS Pro 2.0. Users can perform more complete workflows solely in ArcGIS Pro, such as map creation and data management.

  • Create more effective and meaningful maps with annotation and grids.
  • Getting started with new ArcGIS Pro projects has vastly improved with Favorites.
  • Modify topology properties directly in ArcGIS Pro.
  • Enhanced traverse tool improves COGO workflows.
  • Highly requested context menu options for importing and exporting data included in the Catalog pane.

Users of ArcGIS Pro can now create map notes in 3D in a scene.

Innovations

ArcGIS Pro 2.0 features the following innovations.

  • Explore 3D landscapes with new 3D navigation controls, and sync the views of 3D and 2D maps.
  • Layouts are more useful and powerful with embeddable dynamic interactive charts.
  • Improvements to 3D drawing including feature drawing by camera distance and enhanced lighting of 3D objects make 3D visualizations even better.
  • Analytics improvements with fill-missing-values tools and enhanced spacetime cubes.
  • Get more done with new geoprocessing tools.

ArcGIS Platform Integration

ArcGIS Pro 2.0 works better with the rest of the ArcGIS platform, including ArcGIS Online, ArcGIS Enterprise and Esri’s library of ready-to-use apps. Cross-platform workflows are now easier and more powerful than ever.

  • Enhancements for editing and interacting with the geodatabase in the ArcGIS Pro 2.0 SDK.
  • Consume native OGC Web Feature Service (WFS) Services directly in ArcGIS Pro.
  • Sync with feature layers that reference data registered in Portal for ArcGIS 10.5.1.
  • Vertical coordinate systems are included when sharing web scenes and web scene layers.
  • Continue to work in ArcGIS Pro while packaging operations complete in the background.

Get the full details on what’s new in ArcGIS Pro 2.0.

About the Author: Tracy Cozzens

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Components

With a subscription to ArcGIS® Online, utilities can manage digital mapping content in the secure, cloud-based Esri® technology environment. Members of your organization can publish their data to ArcGIS Online and create web maps and apps that can be shared with whoever needs them. Existing ArcGIS Desktop customers who are current with their maintenance are entitled to ArcGIS Online.

ArcGIS Solutions for Water is a collection of ArcGIS solutions that provide map and app configurations that enable common water utility mapping workflows that leverage spatial information. The ArcGIS Solutions for Water maps and apps are designed to be configurable and extensible to meet the unique needs of individual water utilities.

They are freely available for water utilities to deploy on their licensed Esri software, and they are fully supported and maintained by Esri. New map and app configurations are continually being developed, and the source code is generally available for download. For more information, please see the white paper Implementing ArcGIS for Water Utilities.


Course Syllabus

Prerequisite: Familiarity with MS Office or OpenOffice software, internet browsing, downloading, and emailing. Microphone capability on computer.

Credits: 4, graduate credit

Course Description

This course teaches the fundamental geographic, cartographic, and technological concepts required to produce informative, meaningful maps that illustrate geographic phenomena. By using a combination of internet and desktop geographic information software, students perform geocoding, thematic mapping, web map creation, and spatial analysis. Maps are generated from publicly available published and crowd-sourced data sets, and individual geographic data sets created from scratch. Students use Google Earth, Google MyMaps, ArcGIS, ArcGIS Online, Bing Maps, Quantum GIS, Batchgeo.com, and WorldMap to create and publish maps in various media formats including web maps, 3-D, and video. Understanding the nature of geographic data and how to best represent the data in mapped form is emphasized.

Course Objectives

To learn about the fundamental principles of geography - location, place, regions, human/environment interaction, and movement – and understand why they are important.

To obtain an understanding of how the earth and geographic information are modeled in order to represent spatial phenomena that communicates both human and physical concepts and ideas.

To understand and apply the cartographic principles of map projection, orientation, scale, layout, symbology, type, and color, to produce informative maps of publishable quality.

To gain experience using a variety of geographic information software programs, to be able to effectively convert geographic information into maps, presentations, and video, and to develop an advanced proficiency using a software of choice.

To understand the breadth and depth of the geospatial industry and Geographic Information Systems (GIS).

Course Learning Outcomes

Upon conclusion of this course students will be able to:

  • Design and create informative, communicative maps of publishable quality.
  • Effectively use maps for feature and place location, identification, distance and area measuring, route selection and navigation.
  • Read maps with a critical eye.
  • Complete basic analytical functions using GIS.
  • Use free software and publicly available data to make maps and geographic visualizations.
  • Describe the Global Positioning System (GPS) and its use.
  • Produce static and animated 3d maps.
  • Describe the concept of map projections and know which to use when.
  • Produce video animations that communicate phenomena across space and time.
  • Georeference tabular and textual information into various geographic data formats.
  • Explain map data sources, and employ techniques to harvest data from various sources for map creation.
  • Collect geographic information using GPS, online, and desktop mapping.
  • Describe the concepts, technical issues, and applications of GIS technology.
  • Conduct collaborative mapping.
  • Understand when to normalize datasets by population and area, and how to do this.

No textbook is required. Reading assignments will be a mix of chapters from various textbooks, journal articles, and online publications made available on the course website. See the Textbooks section below for a list of textbooks from which chapters will be used as reading material for this course. Hardcopies of the textbooks are available in the Harvard library system.

Course Format

With the exception of the midterm and class project presentation weeks, each 2 hour class will include 1) lecture 2) map analysis critique and discussion, 3) software demonstration, and 4) lab introduction, with a brief review of the previous week’s lab, if applicable.


Using spatial join in ArcGIS for Desktop? - Geographic Information Systems

CGA offers several non-credit technical training workshops related to GIS (Free to Harvard affiliates but registration is required). The workshops are:

  • Geo Humanities with Omeka Neatline-Cambridge, by Paul Cote, 4:00-6:00pm, January 29 th , 2015
  • GIS Basics with ArcGIS-Cambridge, by Sumeeta Srinivasan, 1:00-3:00pm, January 30 th ,2015
  • GIS Basics with ArcGIS-Longwood, by Sumeeta Srinivasan, 1:00-3:00pm,February 6 th , 2015
  • Wrangling Data into Maps-Cambridge, by Jeff Blossom, 1:00-3:00pm, February 6 th , 2015
  • Wrangling Data into Maps-Longwood, by Jeff Blossom, 1:00-3:00pm, February 13 th , 2015
  • Making Sense out of Spatial Data-Cambridge, by Sumeeta Srinivasan, 1:00-3:00pm, February 13 th , 2015
  • Making Sense out of Spatial Data-Longwood, by Sumeeta Srinivasan, 1:00-3:00pm, February 20 th , 2015
  • Geoprocessing with Model Builder-Cambridge, by Giovanni Zambotti, 1:00-3:00pm, February 20 th , 2015
  • WorldMap Training-Cambridge, by Ben Lewis, 1:00-3:00pm, February 27 th , 2015

More information about technical training workshops and registrations can be found here.


    "Geodesign: Why, What, How?", presented by Joe Liao, a recent GSD graduate and product engineer at Esri. February 12 th , 2015, 12:00-1:30pm. Room S153, CGIS South Building, 1730 Cambridge St, Cambridge, MA.
    "Beyond Mapping: Reconstructing Archaeological Cartography From Archival Data", presented by Gabriel Pizzorno, Lecturer on History at Harvard University. February 26 th , 2015, 12:00-1:30pm. Location to be announced soon.

The 2015 Fisher Prize for excellence in GIS will be given to one graduate and one undergraduate student who must be enrolled in the academic year 2014-2015 and in good standing to be considered for the award. Group projects are allowed. The Prize is a cash award of $500 each given to the top undergraduate and graduate entries. The deadline is 11:59 p.m. Monday, April 27 th , 2015. To submit your work, follow the guidelines listed on the Fisher Prize page.

The Esri Development Center (EDC) Student of the Year is an annual award open to all Harvard students, sponsored by Esri and administered by the CGA. Application deadline is March 31 st , 2015. For more information and to apply, please click here.

This exhibit explores early experimentations in visualization impelled by the explosion of empirical data (and the infrastructure for collecting statistics) since the late 18th century. It includes thematic maps of disease, crime, geological strata, ethnographic patterns, and electoral results. This exhibit will be on display until February 10 th , 2015. Map Gallery Hall, Pusey Library. View more information

Extension-CSCI E-8: Web GIS: Principles and Applications is offered this semester on Thursdays at 7:40 -9:40pm. This course provides students with a comprehensive overview of web GIS, teaches students the state-of-art web GIS application development skills including geospatial web services, cloud GIS, mobile GIS, geoportals and mashups, and inspires students with web GIS application case studies in e-government and e-business. For more details, please click here.

Extension-ISMT E-155: Geographic Communication Today teaches the fundamental geographic, technological, and cartographic concepts required to produce informative, meaningful maps that illustrate geographic phenomena. By using a combination of Internet and desktop geographic information software, students perform geocoding, thematic mapping, web map mashing, and spatial analysis. Students create and publish maps in various media formats including web maps, 3-D, and video. Understanding the nature of geographic data and how to best represent the data in mapped form is emphasized. For more details, please click here.

Harvard University seeks applications for a preceptor in Geospatial Analysis. The appointment is expected to begin on July 1, 2015. The preceptor will be responsible for designing and teaching introductory undergraduate and graduate courses in geospatial analysis, including geographic information systems (GIS), global positioning systems (GPS), remote sensing and related geospatial science and technology, primarily for students in the social sciences and environmental sciences. In addition, the preceptor will work in collaboration with faculty and the Center for Geographic Analysis to develop GIS tools and geographic data for various courses in the social sciences, environmental sciences, and humanities. read more

The NSF Spatiotemporal Innovation Center provides six summer research fellow positions (two for each site) this year for undergraduates. The undergraduates who are selected will be able to work at one of the three sites (George Mason, UCSB or Harvard) to participate in practical research projects related to spatiotemporal data study. Funding up to $8k will be provided to cover expenses, including lodging, meals and stipend for each student. read more

Students will learn the fundamentals of GIS and how to build digital maps using QGIS. read more

The intent of the competition is to showcase the geospatial technology skills of U.S. undergraduate students. Competing students will create a project that utilizes geospatial technology to address a real-world problem. The student will then present the project and the resulting deliverables as a video (approximately 10-15 minutes in length) which not only highlights their use of geospatial technology, but also demonstrates their communication and presentation skills. read more

The CGA Newsletter is published monthly. Editors of this issue are Fei Carnes and Jeff Blossom.

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Sharon Reid

Academic Librarian

Please contact me for individual help in finding information for your studies and referencing guidance.

  • Available via MS Teams and 01509 222403
  • Pilkington Library, Academic Services Team Office
  • Available all day Mondays, all day Tuesdays and Wednesday mornings

This guide aims to provide you with information about the Library&rsquos resources and services relevant to human geography, physical geography, management, sport and economics.

Use the tabs above to find information about:

  • Print and electronic books [e-books]
  • Journals and journals articles
  • Referencing

Useful tip: before you start using the Library resources on your own computer, laptop or tablet etc. download the Cisco AnyConnect VPN client from IT Services &ndash versions are available for both Mac and Windows.

This gives seamless off-campus access to e-books, e-journals, databases, e-mail and print credits etc.

If you need further assistance, please contact the Library at [email protected] or your Academic Librarian.

Books are available in the Library in both print and electronic format [e-books]. The Library Catalogue will help you locate the shelf-marks for printed books, and give links to e-books.

E-books can be viewed on any computer, both in the Library and off-campus.

Just remember to download the VPN for off-campus access.

Books on the same subject are often kept together at the same shelf-mark. You can find shelf-marks both on the spine of the books, and on the end of the shelves.

For example: Douglas Bryden&rsquos book CAD and rapid prototyping for product design has the shelf-mark 745.20285/BRY. The 745.20285 is the number for product design, and the BRY stands for Bryden.

Books with several editions should be located together. Most of the books on product design are on Level 2, but some books on ergonomics and materials are located on Level 1.

Databases: journal articles and conference papers

You can use your Athens username and password to access many of these databases from off-campus, or via the Remote Working Portal


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