Labeling Bubble maps in Arcmap 10.2 Desktop

Task
- To create a Bubble map of various points and their PH values using graduated symbol sizes.
-Labeling the Point features with their PH value.

FOR SAMPLE DATA CLICK THIS LINK BELOW:
https://www.dropbox.com/s/iaev3uyo7uhgwzx/Points.csv?dl=0
(kindly attribute the production of this data to www.mapsnigeriainitiative.wordpress.com)


Let us have a look at our dataset. In the Table of Contents, we have a Point feature layer which has on its attribute table a field containing the PH values of the different points. The goal here is to use graduated symbol sizes to create a Bubble map with the values in the attribute field –‘PH’.


Right Click on the Point feature layer  > Properties.


In the Layer Properties window, Click on the tab- Symbology (red boxed).
Then since we are dealing with quantitative data, under the features, click on Quantities (red box 2).


1) Select Graduated symbols under quantities (2) In the Value option, select the attribute field of interest- PH (3) Define the number of classes the data will be classified into. (4) Define the range of the symbol size.


A Bubble map is created in the screenshot below. Notice that the symbol sizes are graduated according to increasing value of PH.


Labeling
The goal will be to label the point features with the PH values displayed right inside the marker.
Right Click the Point feature layer and go to Properties.


Click on the Labels tab. Check the box titled ‘Label features in this layer’. Select the attribute field whose values will be used to label the features. Choose font and font size. Next Click on Placement Properties –see cursor arrow position.


In this window-Placement Properties- Select the option in the red box. Click Ok


Next in the Label window, Click on the Label Styles tab. The Label Style Selector window will open. Select a style and Click Ok.


The labels are placed inside the symbols here in the screenshot below.

Publishing FEATURE layers in arcmap as a feature service in ArcGIS online

Task
This short demonstration shows how to share a map or feature layer with ArcGIS online as a feature service.Our map –Selection by Location Demonstration was put together in ArcMap 10.2. The demo will illustrate how to share the map feature layers- Streets, Parcels, Low, Medium and High Tariff Blocks layers to ArcGIS Online as a  Feature layer/service.

ArcMAp must be connected to ArcGIS Online resources. USER MUST BE CONNECTED TO THE INTERNET

Note- This process can only be done by an organizational account holder. See our post titled- Lets look at ArcGIS Online… for more details about ESRI ArcGIS Online accounts.

Procedure
In ArcMap 10.2. Add the feature layers that make up the map. The demo has five layers. Go to File > Sign in. Sign into ArcGIS Online.


Go to File> Share As > Service.


This dialog box will pop up. Pick Publish a service.

Choose the connection that indicates the username for the organizational account. The default is to choose the name of the map in arcmap but the User can change it.


In the next dialog box, Click on the capablities –Choose - Feature access (red box)–instead of tile mapping. Item description (green box) describe the feature service, tag it and give a summary.



Click on sharing and select everyone in organization and public.



Click Publish (red box). During the publishing process, the system might identify errors and pause the process so the User can be correct them. Correct as many as possible and continue to publish.



The contents are transferred online, server side processing and a message box indicating that the service was published.



Sign into ArcGIS Online and Go to MY CONTENT (red box) to check the feature layer.



In the default folder, the feature layer and service definition layer should be present, For the demo, the feature layer is green boxed.

Adding Online Basemaps in ArcMap 10.2

   CLICK ON THIS LINK TO WATCH YOUTUBE VIDEO OF THE DEMO

This post demonstrates how users can add feature layers on to basemaps downloaded from the internet in the arcmap 10.2 environment. Various types of base maps can be downloaded onto the map canvas from the internet resources of ArcGIS.

- User must be connected to ArcGIS online resources via the web to be able to download the base maps.

Procedure

Click on the drop down button beside the Add Data icon, Add Basemap will appear under. In order to download the basemap, make sure ArcMap is connected to ArcGIS Online resources.


Various types of basemaps will appear for download, for the demo, we choose OpenStreetMap.


The basemap will be loaded onto the map canvas. See the Table of Contents- Basemap – OpenStreetMap.


User can pick the Zoom in tool and zoom in to area of interest. For the demo, this is Nigeria, West Africa.


Go to Add Data and load in a shape file layer. The feature layer will automatically finds the geolocation on the base map.


User can save the map using the downloaded base map.

Using Symbology in ArcMap 10.2

Using Symbology feature in ArcMap 10.2 helps the User to better convey the map information to the audience. Symbols define the way points, polygons and polylines are displayed on the map to express information in qualitative or quantitative form .

In this presentation, we will be showing how the Symbology feature in ArcMap 10.2 used to express information about the theme- Population.

We will use a shapefile of Nigeria with attribute table containing data on the 2006 Census data such as the Total population per State, Male and Female population per State to carry out the demonstration. We will look at three ways of symbolizing the data.

- Qualitative- deals with non-quantitative criteria like the regional divisions of the country.For this, we will use the values in the Region Field to group the states into different regions.
- Quantitative- deals with actual quantities estimated in figures. For this, we will be using census_Tot field .
-Qualitative and Quantitative- here the two parameters can be combined to symbolize information on a map.

Shapefile Nigeria


Attribute Table of the Shapefile Population Data. We will working with Fields= Census>Tot (Total Human population in the State), census_Mal (Population of Males in the State) and census_Fem.(Population of females in the State)


Right Click on Layer> Properties. A Layer Properties dialog box will open.


Click on the Symbology Tab and the default shown on the Left hand panel is Single Symbol.


Qualitative display
We want to display the map showing different regions in the Country. Remember on the Attribute table each State is under a region with a regionId
We change the Single Symbol to Categories (red box), Our Value Field is Region (brown box). Then simply click Add All Values and the different regions are loaded in from the Value field (green boxes). Click Apply to view the result.


The map display has divided the country into different regions by grouping the states. In the red boxes, the values in the Field-Region are displayed on the Table of Contents under the layer. Symbology is based on categories with unique values.


Quantitative Display
Next, we want to work with the census_Tot field which is numerical or quantitative. We want to use the symbol feature to group states by population size.
Click on Quantities> Graduated colors(red box), Fill in value field as census_Tot and the figures will appear depending on the Classification into Classes (red box to the right). Once Classes are selected, the census_Tot data will be classified along a quantile color ramp.


The population data is now classified according to the census_Tot field (red boxes) showing the population sizes of the States from Low-medium-High using graduated colors.


In this illustration, we switch to using Graduated Symbols to visualize the population sizes of the States.(see red boxes)


Under the Quantities, the User can visualize the data as Charts. The Chart below represents the ratio of male to female in each state.


Combination of Qualitative and Quantitative – Multiple Attributes
Symbology features allows the User to combine qualitative symbols with quantitative symbols using the Multiple attributes option. In the demonstration below, there is a combination of attributes from the regions field (States according to regional division) and the census_Mal (Population of males per State) . Polygons grouping the States into their respective regions and the point symbol represent the relative sizes of the male population in the States. The red boxes indicate the important classification and Symbology system applied.


Start practicing folks and let us have your feedback and comments.

SPatial join USING ArcToolbox in arcmap 10.2

PLEASE DOUBLE CLICK ON THE IMAGES FOR BETTER RESOLUTION AND VIEWING!!!!!!!!!

Task

Perform a spatial join between a point feature layer (populatedplaceslowincome.shp) and a polygon feature layer (lowincomenations.shp) using ArcToolBox in Arcmap 10.2.

Procedure

Launch Arcmap and Add the feature layers, In the Demo Table of Contents, there is the populatedplaceslowincome and lowincomenations layers. To perform the Spatial Join, we click on the ArcToolBox

In the ArcToolBox, Click Analysis Tools> Overlay >Spatial Join


The Spatial Join dialog window pops up. Fill in the Target and Join features. Take note that the Match operation is ‘Completely Within’ and attribute Operation is One To Many since there is multiple relationship between the attributes of the points and the attributes of the polygon.



The Output Shape file is saved as JoinArcMap and is added onto the Table of Contents as a feature layer..


Right Click on the JoinArcMap layer > Open Attribute Table to crosscheck the Spatial Join.


As observed in the Demo, the attributes of the Lowincomenations polygon feature has been integrated to that of the populatedplaceslowincome.


PLEASE DOUBLE CLICK ON THE IMAGES FOR BETTER RESOLUTION AND VIEWING
Keep practicing and thank you for taking time to be our viewer.

Enjoying the break, here is a cue for what is coming up this week.

A lot of GIS data can be useful in the GPS receiver. Points, Polyline and Polygon features mapped out in the GIS environment may often times need ground truthing or confirmation on the ground using a GPS receiver. In addition, GPS data from the GIS environment may be required to carry out navigation.Consequently, mapping enthusiasts and professionals will need to convert and transfer data from GIS softwares to the GPS receiver.

This week, we start with tips that cover uploading data layers (Points, Polygon and Polylines) from mainstream GIS softwares to the GPS receiver as Waypoints, Route and Tracks.

Check out this presentation on A Refresher on GPS data types stored in a GPS receiver.

We will be using two mainstream GIS softwares -ArcMap 10.2 and QGIS to demonstrate this process . ArcMap 10.2 is part of the ArcGIS suite and is a license subscription sofware while QGIS is an open source freeware.

So stay tuned as we hope this tips will be useful to you all. Feel free to let us have your feedback.