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05-29-2017
08:17 AM
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I am using ArcMap 10.4.1 reviewing some concepts of a projection. The data frame properties look like the below screen shots. Under the Standard Parallels is listed 2:34.83333 or 1:32.5. are these standard parallels meant to be read as degrees and minutes ?
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05-29-2017
08:16 AM
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Yes, My GCS and import fields are set correctly . Do I assume because the GCS is a lat-long format by definition, then the program knows to import in that same format ?
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04-25-2017
02:39 AM
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Hello, I am using ArcMap 10.4.1. I need to import a coordinate. I have ArcMap coordinates set to geographic->World->WGS 1984 (I assume this coordinate system is a true Geographic 3D type that is not projected). The coordinate that I am importing is in latitude-longitude format. Do I have to adjust any settings to tell ArcMap that the coordinate is in lat-long format ?
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04-25-2017
02:17 AM
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Dan, Yes indeed, thanks for that feedback. The 3d polyline was adjusted in its Z value using the Adjust 3DZ function. However, the change was not obvious in ArcMap. I did not see in the attribute table or the properties of the object in ArcMap, having different units or Z values. But the Z value change was observable in CAD. Is it possible to confirm the change in ArcMap ?
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03-26-2017
11:12 AM
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Yes, thank you, I used Field4*0.3048 which gave the correct results. I suppose if I had linework that I needed to adjust the Z value for, then the Adjust 3D Z method is the preferred way ?
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03-25-2017
03:28 PM
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Dan, I see what you are saying. I selected in Arc Toolbox->Data Management Tools->Feature Class->Features->Adjust 3D Z. I did not see an obvious change but did get a successful response that the adjustment was made. Since I am working with points in attribute tables, I think you said the above process will not work for tables but I can use the Field Calculator to calculate the metric units in a new or un-used column of the attribute table. Please confirm if I am now understanding or if there is still some part I may be missing.
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03-25-2017
03:17 PM
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Curtis, Thanks for forwarding to the proper forum, I was unfamiliar. Will look forward to their responses.
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03-25-2017
01:14 PM
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Dan, The example involves python programming which I am not familiar, unfortunately. I did try to copy and paste the lines of code into the python window but got an error on line 1. But if the transformation/projection is complete in every other way, it is just a matter of converting the Z units to meters in excel, if I am understanding correctly.
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03-25-2017
01:12 PM
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Hello, I am using Arc Map 10.3. When I change coordinate systems by selecting Data Management Tools->Projections and Transformations->Project-> fill-out dialogs for XY and Z coordinate to change from State Plane Nad83 Us Feet, NAVD88 to a Geographic WGS84, WGS Ellipsoid; I believe ArcMap is performing both a transformation to a different horizontal datum and a projection from a flat grid based state plane system to an elliptical geographic system. Is my understanding correct or am I missing something.
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03-25-2017
06:45 AM
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Dan, Yes, I believe per the screen shot below, that the Z-Values are true. If I understand, those are turned on or off using the Environments tab in the Transformation of Project, set as "Same as Input". Is my understanding correct?
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03-25-2017
06:35 AM
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Dan, Thanks for that feedback. So if I understand correctly, the actual units will not update, but the Z-Coordinate I selected will update which proves to be the case per my example project. If I "transform from a state plane system such as NAD83, to a geographic system such as wgs84, that involves both a transformation and a projection. Am I correct to assume that is the case ?
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03-25-2017
06:07 AM
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Dan, In arc catalog I created a file database, then imported my points into the database as a feature class. Then I ensured the feature class had a Z coordinate to start with (NAVD88). Then I performed the transformation/projection from NAD83 Intl Feet to WGS84 meters. The XY appeared to change properly to WGS84 but the Z values were still showing feet values. What am I likely doing wrong if I want to get meters as my Z values, assuming it is possible?
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03-25-2017
04:23 AM
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Dan, Ok, if I understand, my project tab "Z Coordinate System" found when populate Output Coordinate System (see screen shot below), is the same as the "Vertical Parameter Button" you are referring ? If I am correct, my elevation values are not changing from feet to meters. I have an elevation, for example of 25.36', that value persists after the transformation (SC Nad83 Intl ft to WGS84 m). What else am I likely missing ?
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03-24-2017
05:17 AM
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Dan, I am not getting the Vertical Parameter button. Below is a screen capture of my project dialog for reference. Perhaps I am missing something or do not have the correct version of ArcMap ?
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03-23-2017
11:44 AM
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