SDX-Cloud: USA GEOIDs for Custom Coordinate Systems

Summary

You can use USA GEOIDs when you create a new SDX-Cloud project with a custom coordinate system. This lets you apply the required vertical reference during project setup. Because GEOID selection is manual, you need to choose the correct model, region, and zone for the project location.

Introduction

This article explains how to select a USA GEOID in the custom coordinate-system flow during SDX-Cloud project creation. The GEOID becomes part of the project configuration and remains stored with the project after creation.

USA GEOID coverage is split by model and region. Mainland United States datasets can also be separated into zones. The detailed tables below can help you match the project location to the GEOID entry shown in the selection list.

Prerequisites

• You can create a new project in SDX-Cloud.
• You know that the project requires a custom coordinate system.
• You know which GEOID model your workflow requires.
• You know the location of the project site so you can choose the correct region or zone.
• The required USA GEOID is available in the selection list during project creation.

Step-by-step instructions

1\. Start project creation

1. Open SDX-Cloud.
2. Start creating a new project.
3. Go to the coordinate-system section of the project setup.
4. Choose the option to use a custom coordinate system.

2\. Open the GEOID selection

Expected result: USA GEOID entries are available inside the existing custom coordinate-system workflow.

1. Enter the coordinate-system settings required for the project.
2. In the custom coordinate-system setup, open the GEOID selection.
3. Review the available USA GEOID entries.

3\. Match the GEOID model

Expected result: You have identified the correct GEOID family and the correct geographic area for the project.

1. Choose the GEOID model that matches your workflow requirements.
2. Check the GEOID name carefully before you continue.
3. Use the project location to narrow the list to the correct region or zone.

4\. Match the GEOID to the project location

Expected result: The selected GEOID matches the project region and is attached to the custom coordinate-system setup.

1. If the project is in the mainland United States, first check whether you should use a mainland zone entry or a full mainland GEOID18 entry.
2. Use the mainland zone layout and bounding-box tables below to identify the correct zone.
3. If the project is in Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands, Guam and the Northern Mariana Islands, or American Samoa, use the regional tables below.
4. If the project is close to a regional or zone boundary, review the bounds carefully before continuing.

5\. Review the configuration and create the project

Expected result: The new project is created with the selected USA GEOID stored as part of its custom coordinate-system configuration.

1. Review the coordinate-system settings together with the selected GEOID.
2. Confirm that the chosen GEOID covers the project location.
3. Complete project creation.

6\. Follow the interactive demo

Use the interactive demo below to review how the custom coordinate system with a grid can be created during project setup.

Expected result: You can review the full project setup flow and see where the custom coordinate system with a grid is created before you configure your own project.

Coverage guide

The detailed coverage tables below list bounds as west, south, east, north in geographic longitude and latitude.

How to choose the GEOID entry

1. Match the GEOID model your workflow requires, such as USA-2003-, USA-2012-12A-, USA-2012-12B-, or USA-2018-.
2. Match the project region, such as mainland United States, Alaska, Hawaii, Puerto Rico, Guam, or American Samoa.
3. If the region is split into zones, use the zone tables below to select the correct entry.

Mainland United States zone layout

The same zone_1 through zone_8 layout applies to these mainland file groups:

• USA-2003-mainland-zone_*
• USA-2012-12A-mainland-zone_*
• USA-2012-12B-mainland-zone_*
• USA-2018-mainland-zone_*

West

Central-west

Central-east

East

North row (about 40N)

zone_1

zone_2

zone_3

zone_4

South row (about 24N)

zone_5

zone_6

zone_7

zone_8

Mainland United States detailed bounds

File suffix

West

South

East

North

Typical coverage

mainland-zone_1

\-130.0

39.9833

\-110.8

58.0

Pacific Northwest, northern Rockies east to the Great Plains

mainland-zone_2

\-113.0

39.9833

\-93.8

58.0

Rockies and northern Plains

mainland-zone_3

\-96.0

39.9833

\-76.8

58.0

Great Plains, Upper Midwest, western Great Lakes north

mainland-zone_4

\-79.0

39.9833

\-59.8

58.0

Northeast and northern Atlantic area

mainland-zone_5

\-130.0

23.9833

\-110.8

42.0

West Coast and southwest interior

mainland-zone_6

\-113.0

23.9833

\-93.8

42.0

Southern Rockies to south-central United States

mainland-zone_7

\-96.0

23.9833

\-76.8

42.0

South-central United States to Southeast and Gulf area

mainland-zone_8

\-79.0

23.9833

\-59.8

42.0

Southeast Atlantic area and Florida

Neighboring mainland zones and the two latitude bands can overlap slightly. If the project is close to a boundary, review the available entries carefully.

GEOID18 full mainland entry

File

West

South

East

North

Notes

USA-2018-mainland-full.tif

\-130.0

23.9833

\-59.8667

58.0

Full mainland extent in one grid. Use this instead of a mainland zone entry when your workflow expects the full mainland GEOID18 file.

Alaska detailed bounds

The same zone_1 through zone_4 layout applies to:

• USA-2003-alaska-*
• USA-2012-12A-alaska-*
• USA-2012-12B-alaska-*

Zone

West

South

East

North

Coverage hint

alaska-zone_1

172.0E

59.9833

204.267E

72.0

High-latitude eastern hemisphere, including Aleutian and Bering-side areas past 180

alaska-zone_2

\-158.0

59.9833

\-125.733

72.0

Mainland and western Alaska, north row

alaska-zone_3

172.0E

48.9833

204.267E

61.0

Eastern hemisphere, south row

alaska-zone_4

\-158.0

48.9833

\-125.733

61.0

Mainland and western Alaska, south row

Hawaii detailed bounds

File pattern

West

South

East

North

USA-2003-hawaii-zone_1.tif

\-161.0

17.9833

\-153.8

24.0

USA-2012-12A-hawaii-complete.tif

\-161.0

17.9833

\-153.8

24.0

USA-2012-12B-hawaii-complete.tif

\-161.0

17.9833

\-153.8

24.0

Puerto Rico and U.S. Virgin Islands detailed bounds

File pattern

West

South

East

North

USA-2003-puerto-rico-zone_1.tif

\-69.0

14.9833

\-63.9333

21.0

USA-2012-12A-puerto-rico-complete.tif

\-69.0

14.9833

\-63.9333

21.0

USA-2012-12B-puerto-rico-complete.tif

\-69.0

14.9833

\-63.9333

21.0

USA-2018-puerto-rico-complete.tif

\-69.0

14.9833

\-63.9333

21.0

Guam and Northern Mariana Islands detailed bounds

File pattern

West

South

East

North

USA-2012-12A-guam-complete.tif

143.0E

10.9833

146.2E

18.0

USA-2012-12B-guam-complete.tif

143.0E

10.9833

146.2E

18.0

American Samoa detailed bounds

File pattern

West

South

East

North

USA-2012-12A-american-samoa-complete.tif

\-174.0

\-17.0167

\-167.8667

\-11.0

USA-2012-12B-american-samoa-complete.tif

\-174.0

\-17.0167

\-167.8667

\-11.0

Quick lookup by place

• Alaska such as Anchorage, Fairbanks, or Juneau usually uses alaska-zone_2 or alaska-zone_4. Aleutian areas that cross 180 can fall in alaska-zone_1 or alaska-zone_3.
• West Coast mainland United States: usually mainland-zone_1 or mainland-zone_5.
• Great Plains: usually mainland-zone_2, mainland-zone_3, mainland-zone_6, or mainland-zone_7, depending on longitude.
• Northeast or Florida: usually mainland-zone_4 or mainland-zone_8.
• Hawaiian Islands: use a hawaii entry.
• Puerto Rico and U.S. Virgin Islands: use a puerto-rico entry.
• Guam and Northern Mariana Islands: use a guam entry.
• American Samoa: use an american-samoa entry.

US Mainland Grid Zones

Alaska Mainland Grid Zones

Limits and notes

• GEOID selection is manual. The system does not auto-select a GEOID.
• SDX-Cloud does not validate whether the selected GEOID matches the coordinate-system setup in this flow.
• Choosing a GEOID outside the coverage area of the project can lead to failed processing.
• This feature is available during new project creation. It does not cover editing the coordinate-system setup for an existing project.
• The selected GEOID remains part of the project configuration after project creation.

Reference links

• Geoid data for Alaska
• Geoid data for mainland US

Related articles

• SDX-Cloud: Coordinatesystems
• SDX-Cloud: Overview

\\Available translations\\: en-us