Creating a map with an image background layer

You can use images as custom base maps in map visualizations. You may want to display data over a floor plan.

This example map chart displays an office floor plan with a point layer. Each bubble is positioned over an employee's desk. The weekly average of customer issues handled per day by the employee determines the size and color of each bubble.

This example hides the default scale. Images do not have a consistent size scale. Image size in a map background layer is also dependent on what coordinates the user sets for the corners of the image.

Dataset

This example uses two tables and a background image. You can import the two tables into your app using the web file connector.

CustomerIssues

CustomerIssues

Date	EmployeeNumber	CustomerIssues
8/1/2019	1	24
8/1/2019	2	31
8/1/2019	3	21
8/1/2019	4	42
8/1/2019	5	24
8/1/2019	6	40
8/1/2019	7	40
8/1/2019	8	19
8/1/2019	9	23
8/1/2019	10	47
8/1/2019	11	38
8/1/2019	12	21
8/1/2019	13	22
8/1/2019	14	15
8/1/2019	15	30
8/1/2019	16	46
8/1/2019	17	41
8/1/2019	18	31
8/1/2019	19	50
8/1/2019	20	27
8/1/2019	21	35
8/1/2019	22	38
8/1/2019	23	37
8/1/2019	24	31
8/1/2019	25	13
8/1/2019	26	11
8/2/2019	1	35
8/2/2019	2	31
8/2/2019	3	33
8/2/2019	4	14
8/2/2019	5	24
8/2/2019	6	33
8/2/2019	7	40
8/2/2019	8	14
8/2/2019	9	44
8/2/2019	10	24
8/2/2019	11	37
8/2/2019	12	39
8/2/2019	13	49
8/2/2019	14	16
8/2/2019	15	42
8/2/2019	16	13
8/2/2019	17	45
8/2/2019	18	48
8/2/2019	19	46
8/2/2019	20	18
8/2/2019	21	18
8/2/2019	22	45
8/2/2019	23	47
8/2/2019	24	31
8/2/2019	25	10
8/2/2019	26	21
8/3/2019	1	16
8/3/2019	2	34
8/3/2019	3	15
8/3/2019	4	44
8/3/2019	5	49
8/3/2019	6	18
8/3/2019	7	16
8/3/2019	8	41
8/3/2019	9	27
8/3/2019	10	46
8/3/2019	11	21
8/3/2019	12	49
8/3/2019	13	38
8/3/2019	14	30
8/3/2019	15	48
8/3/2019	16	17
8/3/2019	17	42
8/3/2019	18	48
8/3/2019	19	44
8/3/2019	20	44
8/3/2019	21	12
8/3/2019	22	44
8/3/2019	23	17
8/3/2019	24	24
8/3/2019	25	25
8/3/2019	26	33
8/4/2019	1	20
8/4/2019	2	45
8/4/2019	3	32
8/4/2019	4	37
8/4/2019	5	32
8/4/2019	6	50
8/4/2019	7	41
8/4/2019	8	14
8/4/2019	9	37
8/4/2019	10	39
8/4/2019	11	28
8/4/2019	12	35
8/4/2019	13	24
8/4/2019	14	19
8/4/2019	15	25
8/4/2019	16	26
8/4/2019	17	23
8/4/2019	18	45
8/4/2019	19	48
8/4/2019	20	36
8/4/2019	21	40
8/4/2019	22	21
8/4/2019	23	10
8/4/2019	24	42
8/4/2019	25	35
8/4/2019	26	26
8/5/2019	1	24
8/5/2019	2	28
8/5/2019	3	44
8/5/2019	4	19
8/5/2019	5	34
8/5/2019	6	37
8/5/2019	7	14
8/5/2019	8	26
8/5/2019	9	38
8/5/2019	10	25
8/5/2019	11	41
8/5/2019	12	35
8/5/2019	13	48
8/5/2019	14	36
8/5/2019	15	36
8/5/2019	16	37
8/5/2019	17	31
8/5/2019	18	44
8/5/2019	19	21
8/5/2019	20	28
8/5/2019	21	13
8/5/2019	22	10
8/5/2019	23	50
8/5/2019	24	35
8/5/2019	25	11
8/5/2019	26	39
8/6/2019	1	26
8/6/2019	2	14
8/6/2019	3	45
8/6/2019	4	27
8/6/2019	5	33
8/6/2019	6	21
8/6/2019	7	14
8/6/2019	8	45
8/6/2019	9	41
8/6/2019	10	35
8/6/2019	11	35
8/6/2019	12	13
8/6/2019	13	35
8/6/2019	14	26
8/6/2019	15	40
8/6/2019	16	14
8/6/2019	17	20
8/6/2019	18	23
8/6/2019	19	11
8/6/2019	20	23
8/6/2019	21	31
8/6/2019	22	48
8/6/2019	23	39
8/6/2019	24	50
8/6/2019	25	47
8/6/2019	26	40
8/7/2019	1	49
8/7/2019	2	39
8/7/2019	3	16
8/7/2019	4	28
8/7/2019	5	46
8/7/2019	6	37
8/7/2019	7	36
8/7/2019	8	15
8/7/2019	9	18
8/7/2019	10	25
8/7/2019	11	12
8/7/2019	12	37
8/7/2019	13	40
8/7/2019	14	35
8/7/2019	15	11
8/7/2019	16	12
8/7/2019	17	22
8/7/2019	18	16
8/7/2019	19	46
8/7/2019	20	39
8/7/2019	21	41
8/7/2019	22	26
8/7/2019	23	25
8/7/2019	24	34
8/7/2019	25	50
8/7/2019	26	41

EmployeeData

EmployeeData

Employee	EmployeeNumber	Latitude	Longitude
Nehru Pollard	1	2.1	-2.1
Duncan Bell	2	1.675	-2.1
Arthur Miller	3	2.1	-1.6
Latifah Randall	4	1.675	-1.6
Glenna Giles	5	2.1	-1.1
Chaim Gates	6	1.675	-1.1
Elijah Mcgowan	7	2.1	-0.585
Serina Richards	8	1.675	-0.585
Nora Odonnell	9	2.1	0.595
Fiona Craig	10	1.675	0.595
Kirestin Mcguire	11	2.1	1.155
Francesca Wilkerson	12	1.675	1.155
Virginia Sanford	13	2.1	1.6
Beau Weeks	14	1.675	1.6
Justin Cook	15	2.1	2.2
Lisandra Sloan	16	1.675	2.2
Brody Ball	17	2.1	2.6
Kirk Welch	18	1.675	2.6
Julian Mcgee	19	0.7	3.25
Geoffrey Wheeler	20	0.7	3.7
Carter Leonard	21	0.14	3.25
Noel Watson	22	0.14	3.7
Damian Everett	23	-0.3	3.25
Justina Frazier	24	-0.3	3.7
MacKenzie Garcia	25	-0.85	3.25
Germane Carey	26	-0.85	3.7

Background image

How I built this

Gehen Sie folgendermaßen vor:

1. Add the data sources to your app and associate the tables using the EmployeeNumber fields in each table.
2. In a sheet, add a map chart.

3. In Map settings, do the following:

   • Change Base map to None.
   • Change Projection to User defined (degrees).

4. In Appearance > Presentation, do the following:

   • Toggle the Scale bar to Off.
   • Set Limit zoom levels to Custom and set the zoom to 7x zoom - 8x zoom.

5. Add a background layer to the map chart and in Data, do the following:

   • In Format, select Image.
   • Set the URL to https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Resources/Images/ui_map-image-background-example.png.
   • Set the Top left corner to 2.5 for Top (latitude) and -4.1 for Left (longitude).
   • Set the Bottom right corner to -2.5 for Bottom (latitude) and 4.1 for Right (longitude).
   Informationshinweis

   At this point in the example, the image does not appear yet. After you add a point layer with the next step, the map updates with the correct scale and image position.

6. Add a point layer to the map chart and do the following:

   • In Data, add Employee as the field.
   • In Location, select Latitude and longitude fields. Set Latitude as the Latitude field and Longitude as the Longitude field.
   • In Size & Shape, set Size by Avg(CustomerIssues).

   • In Colors, do the following:

     • Set Colors to Custom and color By measure.
     • Select Avg(CustomerIssues) as the measure.
     • Select Diverging classes as the color scheme.

To get the same look and feel as the image at the top of the page, set the app theme to Sense Classic.