# Problems using the 'Split' tool with ArcGIS

I'm running into difficulty when using thesplittool with ArcGIS 10.

I am trying to split lines using a grid that I generated using the Fishnet command. Each gridcell has a unique text value as a name (FID converted to a string), which is mySplit Field. However, I can't tell whether it is the size of my grid (300000 cells), or if it is due to no line being within a cell that causes the error.

I tried breaking my grid cell into smaller pieces of ~50000 cells, but I still got an error occuring. Then I tried selecting only cells that were intersected by the lines, and just splitting using those cells, and still got an error. The strange part about the error messages, were that the analysis would run for about 30 minutes or so, producing output, and then an error message would appear on screen, but no explanation - no error number or no further details.

What I have no resorted to doing is splitting the grid into 500 smaller grids, and then splitting each subgrid on itself. Then I will loop through every cell, and clip the lines to each cell. The problem with this approach is that it is taking a long time (~20 hours so far).

Are there any ways I can improve this process?

Here's another potential workflow: 1. Intersect the Roads with the polygons, outputting "lines". This will divide the roads along the polygons. 2. Use the split by attribute tool or something similar to divide the roads into separate files based on the FID field from the polygons.

I suspect this will be much faster than looping through the clip function.

One way to work around this would be to loop in Python, selecting each grid cell, clipping the other layer usingClip_analysis(), and then selecting the next cell.

I have no idea how long this would take, but it shouldn't require any manual input, possibly saving you some time.

## Projection issue with ESRI JSAPI and ArcGIS map service

I was trying to obtain a gpx file with some coordinates by drawing on an Openlayers map with an ArcGIS baseMap.

When I draw the polyline and create the gpx, if I open it on Google Earth, what I see is not what I drawed before, the line is totally different from the original and not positioned where I drawed it. I know it's a projection problem, I've tried trasforming the geometry object from Mercator to Geographic, also getting directly the geographic coordinates from the map coordinates, but nothing. I tried to set "spatialReference" to 4362 and then to 3857, but nothing changes.

I'm going to use that .gpx on a gps device (the next week I'll go to the Svalbard islands and I need some gps tracks to go around Longyearbyen by snowmobile, there there aren't any sign of life out the town, so I must be prepared to it), when I'll be there I'll adjust the output right for the device they will rent to me, but now I need to save on the .gpx file almost the right coordinates.

I'm getting from the map those coordinates: lat: 61.22582068741976 lon: 4.684820015391338 when I'm expecting instead something around 78. lat and 15. lon.

This is some of the code I use to create the map (I'm not pasting the code I know it's not responsible of my problems):

Here I'm using wkid 32633 that is the default for that map, tried to change with known ones, but nothing happened.

And now the code I use to get the coordinates:

"tra" is a variable that stores all the code I'll insert into the gpx file with an other function. The "webMercatorToGeographic" function transform the map coordinates to geographic ones.

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ArcGIS is a suite of software used to create and use maps, compile geographic data, analyze mapped information, share and discover geographic information, and manage geographic information in a database. It is available in Gorgas and Rodgers libraries.

Kim Smalley, Web Developer in the UA Libraries’ Web Services department, will offer both introductory and intermediate workshops on ArcGIS this semester. Here are the details for the two-part Intermediate ArcGIS series:

Intermediate ArcGIS Part One
Wednesday, November 19, 2014
2:00 p.m. – 3:30 p.m.
Gorgas Library Room 109A
Prerequisite: Intro to ArcGIS

This workshop will expand on the basic skills acquired in the Introduction to ArcGIS software workshop. The workshop will begin to develop skills for working with data from websites that provide resources for ArcGIS. You will learn how to obtain the data, download it and use it in a map.

Intermediate ArcGIS Part Two
Wednesday, December 10, 2014
2:00 p.m. – 3:30 p.m.
Gorgas Library Room 109A
Prerequisites: Intro to ArcGIS & Intermediate ArcGIS Part One

This workshop will expand on the skills acquired in Intermediate ArcGIS Part One. The workshop will demonstrate how to create your own data for use in a map.

## Technology Skills

• Access software — Avaya Identity Engines
• Analytical or scientific software — Data visualization software IBM SPSS Statistics SAS The MathWorks MATLAB (see all 15 examples)
• Customer relationship management CRM software
• Data base management system software — Microsoft SQL Server
• Data base user interface and query software — Microsoft Access MySQL Oracle software Structured query language SQL
• Development environment software — C Ruby
• Electronic mail software — Microsoft Outlook
• Enterprise application integration software — Atlassian Bamboo Jenkins CI
• Enterprise resource planning ERP software — SAP software
• File versioning software — Apache Subversion Git
• Graphics or photo imaging software — Microsoft Visio
• Internet browser software — Web browser software
• Internet protocol IP multimedia subsystem software — Voice over internet protocol VoiP system software
• Map creation software — ESRI ArcGIS Geographic information system GIS software
• Object or component oriented development software — C++ Oracle Java Practical extraction and reporting language Perl R (see all 5 examples)
• Office suite software — Microsoft Office
• Operating system software — Linux Microsoft Windows
• Presentation software — Microsoft PowerPoint
• Project management software — Microsoft SharePoint
• Spreadsheet software — Microsoft Excel
• Web platform development software — Hypertext markup language HTML
• Word processing software — Microsoft Word

Hot Technology — a technology requirement frequently included in employer job postings.

Technologies for obtaining, collecting and creating spatial data continue to advance use of tracking devices, cell phones and satellite imagery such as Google Earth are advancing and becoming widespread. Learn how these technologies have broadened and enhanced the field of spatial analysis in public health research and practice.

Introduces statistical techniques used to model, analyze, and interpret public health related spatial data. Analysis of spatially dependent data is cast into a general framework based on regression methodology. Topics covered include the geostatistical techniques of kriging and variogram analysis and point process methods for spatial case control and area-level analysis.

## Nuts and Bolts

Most designers can’t wait to export layers out of ArcGIS so beautification can begin. In this one-hour hands-on session we won’t do that. Instead, we’ll make a beautiful map using free datasets and ArcGIS tools. Doubters welcome.

### GIS Workshop: Getting Your Data on a Map

Wednesday, September 19
1:00 – 2:00pm
Campbell Hall, Room 105
University of Virginia

Session repeats on
Thursday, September 20
3:00 – 4:00pm
Adlerman Library, Room 421 (New Electronic Classroom)
University of Virginia

Do you have GPS points or a list of Latitude and Longitude you would like to show as points on a map? This session will show you how to turn your data into map layers and how to connect them to make lines and polygons as well.

### GIS Workshop: Making Your First Map

Session repeats on
Thursday, September 13
3:00 – 4:00pm
Adlerman Library, Room 421 (New Electronic classroom)

### GIS Workshop: Gazetteers

Wednesday, April 11
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall
University of Virginia

Repeats on:
Thursday, April 12
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall
University of Virginia

What are gazetteers anyway? They are geographical directories or dictionaries. This session will discuss gazetteers and why they are so useful.

### GIS Workshop: Python in ArcGIS

Wednesday, March 28
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall
University of Virginia

Repeats on:
Thursday, March 29
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall
University of Virginia

This session will show users how to create tools in ArcGIS using Python.

### GIS Workshop: Introduction to Python

Wednesday, March 21
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall

Repeats on:
Thursday, March 22
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall

Python is a general purpose, high-level programming language. This session will give users the basics of Python for use in ArcGIS.
Please note: This workshop is a prerequisite for the Python in ArcGIS workshop on March 28/29.

All Scholars’ Lab events are free and open to all. No registration is required.

### GIS Workshop: Historical GIS Data

GIS Workshop: Historical GIS Data
Wednesday, March 14
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall

Repeats on:
Thursday, March 15
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall

Most historical GIS data comes from old maps. We will talk about and use resources for finding GIS data for distant times.

### Geocommons Workshop

Wednesday, February 29
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall, University of Virginia

Repeats on:
Thursday, March 1
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall, University of Virginia

Geocommons.com is a free online alternative to desktop GIS for mapping and analyzing your data. We’ll walk through the steps to upload data, make and share maps, and do analysis. We’ll focus on the advanced analysis tools offered through Geocommons. If you prefer Mac or PC, Firefox, Chrome, or IE, you’ll learn to use new web-based tools to make and share your maps with the world using your web browser. No Geographic Information Systems experience required.

### ArcGIS Online Workshop

Wednesday, February 22
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall, University of Virginia

Repeats on:
Thursday, February 23
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall, University of Virginia

ArcGIS.com is a free online alternative to desktop GIS for mapping and analyzing your data. We’ll walk through the steps to upload data, make and share maps, and do analysis. If you prefer Mac or PC, Firefox, Chrome, or IE, you’ll learn to use new web-based tools to make and share your maps with the world using your web browser. No geographic information systems experience required.

### GIS Workshop: Finding US Census Data

Wednesday, February 8
10:00 – 11:00 a.m.
Brown Library Electronic Classroom
Clark Hall

Repeats on:
Thursday, February 9
4:00 – 5:00 p.m.
Brown Library Electronic Classroom
Clark Hall

The United States Census has made big changes in their surveys and in the online tools to find and use US Census datasets. Join us for a hands-on session introducing the newly redesigned American Factfinder online tool for discovery and access to free data from the US Census. No experience working with US Census data or geographic information systems is required.

## 2. Material and methods

15 The Walloon Natura 2000 habitat description methodology is described in an unpublished user's manual drafted by Dufrêne et al. (2006). The manual explains how to recognize and characterize each habitat unit in the field. Each habitat unit receives a specific field code and is described by the habitat or habitat complex that composes it according to a version of the European Nature Information System (EUNIS) (Davies et al., 2004) typology adapted to Walloon habitats.

16 Field biologists have to fill out several forms appropriate to the main types of habitat. Each form records information about habitat composition, structure and perturbation for each habitat unit, which are qualified criteria for conservation state evaluation. This data collection is based on a full inventory of the habitat units in open fields, transects along water courses and numerous small sampling units in large forest habitats. The information are completed by full vegetation records.

17 The main purpose of recording these variables is to obtain a detailed description of each habitat unit to evaluate its conservation state as accurately as possible at the local level and also at site scale by combining unit values for the same habitat. These precise information will be used to measure habitat quality, which depends upon:

18 – composition (integrity of species assemblage, number of characteristic species, etc.),

19 – structure (surface, connectivity, vertical and horizontal stratification, diversity of states, dead wood quality and quantity, etc.).

20 It will also be used to evaluate the impact of perturbations. For each habitat type, several indicators are used and threshold values are set to evaluate their quality. The conservation state of the habitat unit is expressed by a combination of the different quality values of the indicators.

21 Habitats are modeled as polygons, lines or points depending on the area they cover. In the field, they are manually delineated on geographic maps. Positioning is helped by portable GPS units.

22 Habitat mapping is achieved using Environmental System Research Institute ArcGIS 9.1 software. Layers are saved as polygons, lines or points under the same dataset in a personal geodatabase. Datasets are defined with the "Belge Lambert 1972" coordinates reference system. The digitization process is facilitated by the use of ortho-rectified vertical aerial photographs, 1/10,000 topographic maps and coordinates recorded with a field GPS.

23 Information concerning each habitat unit are saved in a MS Access 97 relational database. This database contains up to 41 tables, 36 relation rules between tables and 389 different fields. Dedicated forms help the users in inputting all habitat data.

24 The Natura 2000 extension for ArcGIS 9 is an ActiveX DLL written in Visual Basic 6. The DLL intensively uses the objects accessible through the ArcObjects interface (Zeiler, 2001 Burke, 2003). MS Object Linking and Embedding (OLE) and MS Database Object Library 3.51 are used to communicate with the MS Access database. Structured Query Language (SQL) is used to retrieve data from the Access database. Intensive use is made of the Microsoft Component Object Model (COM) technology (Lewis, 1999). COM is a standard or protocol that connects one software component or module to another. With this protocol it is possible to build reusable software components that can be dynamically interchanged in a distributed system (Figure 1).

## Adaptability of ArcGIS apps proves a success with staff on the front line at Anglian Water

Esri builds the world’s most powerful mapping and spatial analytics software. In the process, this global market leader in geographic information systems harnesses the concept of location, location, location to drive both efficiency and digital transformation for its clients

Since Anglian Water launched its Keep It Clear behaviour change programme in 2010, aiming to change the way people dispose of FOG and non-flushable material, they have reduced incidences of sewer blockages by more than 40% in targeted areas.

The largest water and wastewater company in England and Wales geographically, with more than six million customers and 5,000 members of staff in a patch covering 27,500 square kilometres, Anglian has a huge region of responsibility that stretches from the Humber estuary to the Thames estuary, and from Buckinghamshire to the East coast. Across the region, the volume of waste it deals with daily is enough to fill more than 300 Olympic-sized swimming pools.

The fact that the waste travels through more than 76,000km of sewers on route gave rise to the Keep It Clear behaviour change programme, with its overarching aim of transforming behaviours in a bid to end the 40,000 blockages each year that lead to pollution and flooding.

Key weapons in the armoury have been the deployment of the ArcGIS Operations Dashboard and Survey123 Online apps available within the Esri ArcGIS Geographic Information System (GIS) solution provided by ESRI UK. Flexible and user-friendly, the apps form a solution that has made the information gathering process markedly more efficient for Anglian Water staff on the front line and, as a result, enabled a much swifter identification of hotspots.

Dave Owen, ESRI UK’s Account Manager for Anglian Water, says: “These particular software solutions have been taken up widely by water companies for use in tackling real problems on the ground. “One of the main attributes is that the software is so flexible and configurable, clients can adapt it themselves to suit their own purposes – they don’t need to come back to use our expertise. ArcGIS is very popular because of that.”

In the Keep It Clear behaviour change programme, Anglian Water staff work with businesses, schools and households in areas exhibiting a higher than normal number of sewer blockages to identify the causes.

Ultimately the aim is to educate and to change behaviours. Originally the process involved working with ad-hoc tools and spreadsheets which was time consuming and error prone.. By way of contrast, using Survey123 allows the whole task to be completed within just the one app – an app that also works offline when there is no mobile signal.

The Operations Dashboard identifies increases and decreases in the number of blockages and is searchable by sewer type, the tool allows the user to read and interpret the data visually and monitor progress.

“In moving away from a largely paper-based process, Anglian Water also wanted a fully location aware solution and to improve the accuracy of the data recorded generally, reducing or eliminating the need to QA captured data before being able to interpret and respond to it”, says Dave Owen.

“The surveys uploaded help to identify factors such as the wrong type of things being disposed of down water pipes, such as fat and grease, but if there are repeated problems, the question will be raised whether a stretch of the infrastructure itself needs attention.

“Is something broken or starting to crumble? The information feeds into the company’s overall maintenance programme, giving an indication of work needed that could perhaps prevent a leak.”

Because problem areas are tracked in such detail, the resultant profile also offers up another valuable tool – the ability to do a cost and benefits analysis of different ways to solve problems identified.

Overall, the solution has enabled a significant improvement in Anglian Water’s ability to identify the causes and therefore reduce the incidence of sewer blockages, which in turn reduces the number of call-outs and the disruption from digging up roads. Ultimately this enables improvement in the service offered to customers.

## DNR GPS tutorial – GPS data to Michigan Georef in ArcGIS

1) Launch DNR GPS and ensure the projection is set to None (File > Set Projection and click the Set Projection to NONE button:

2) Connect your GPS and turn it on. You should see a message near the top of the window that your GPS now connected. If you don’t, verify the GPS is on, check your cable, and select GPS > Connect to Default GPS. If that fails, try GPS > Find GPS.

4) To save your GPS data, choose File > Save To > File… and Save as type… text file (comma delimited) (*.txt). Consider this file your ‘backup’ that can be easily opened by DNR GPS without issue. Next, choose File > Save To > File… and Save as type: ESRI Shapefile (*.shp). This file can be manipulated in your GIS software.

5) Launch ArcMap and add the shapefile you just saved in step 4 to your map.

6) Make ArcToolbox visible and expand Data Management Tools > Projections and Transformations > Feature > and double-click the Project tool to open it. You can also open the Search window (Windows > Search or Ctrl-F) and search for the Project (Data Management) tool.

7) Add your shapefile as the Input Dataset and verify that the Input Coordinate System is GCS_WGS_1984. Choose the location and name of your output file (maybe adding MGRF to the end of the file name). Click the Spatial Reference Properties icon to select the Output Coordinate System. Expand Projected Coordinate Systems, then State Systems, and select NAD 1983 Michigan GeoRef (Meters).

Tip: If you right-click on this (or any) projection definition and choose “Add to Favorites” it will be easier to find in the future.

8) Click OK to run the tool. Your re-projected layer will be added to your map after the tool has finished. You can verify its projection by opening the layer’s properties and examining the Source tab. If all went well, the Projected Coordinate System should read NAD_1983_Michigan_GeoRef_Meters.

## Esri ArcGIS Review

ArcGIS is a geographical information software that enables organizations to create, manage, share, and analyze spatial data. It is the heart of the Esri Geospatial Cloud suite. With it, organizations can connect maps, data, people, and apps so they can make data-driven decisions faster. The platform does this by providing users tools to help them find, utilize, create, and share maps using any device.

As ArcGIS is a cloud-based solution, users can access it anytime and anywhere. Some of its main features include spatial analysis and data science, mapping, field operations, 3D GIS, and imagery and remote sensing. ArcGIS’s versatility allows users to leverage the software’s capabilities for various implementations, patterns, and approaches to further extend its reach and/or purpose across the organization.

### Overview of Esri ArcGIS Benefits

ArcGIS has advanced capabilities like 2D maps, 3D storytelling, 3D animation, 3D landscapes, and more.

Accurate and Dynamic Maps

ArcGIS allows you to create maps based on the geospatial data stored in the Esri database. Thanks to its intuitive and sophisticated ribbon-based contextual user interface, you have all the features you need the moment you need them. Easy access to powerful features like multiple maps, layouts, and multi-threaded geo-processing makes it easy for users to build maps that are precise down to the minutest detail. Better 3D visualization lets you render more dynamic and visually stunning maps that you, your colleagues, and clients can appreciate.

Customizable Interface

The ArcGIS interface can be tailored to suit the user’s preferences. You can include capabilities that you usually use nearby for quick and easy access. You can also select and set repetitive tasks for automation. With ArcGIS, everything can be streamlined, allowing you to accelerate your tasks and get more work done.

Quick Map Sharing

Any and every map you create within the ArcGIS platform can be shared instantly as web scenes and web maps via ArcGIS Online and ArcGIS Enterprise. This function fuels collaboration between individuals, teams, and even whole departments.