Problem with st_bbox in PurpleAir

[asmarcheva]

Every st_bbox we have used in the get_sensors_data function returns the same sensors

[cole-brokamp]

Hi, thanks for the note. Could you provide a minimal, reproducible example that illustrates the unexpected result? That will help best identify the problem so we can decide how to fix it.

[asmarcheva]

These give the same sensors output. The first is from Ithaca, NY, the second is the example from the documentation

get_sensors_data(st_bbox(
  c("xmin" = -76.52, "ymin" = 42.41,
    "xmax" = -76.47, "ymax" = 42.46),
  crs = 4326) , fields = c("name"), location_type = "outside") 

get_sensors_data(st_bbox(c("xmin" = -84.82030, "ymin" = 39.02153,
                           "xmax" = -84.25633, "ymax" = 39.31206),
                         crs = 4326), 
                 fields = c("name"), location_type = "outside")

[cole-brokamp]

Thanks, could you make it so that I could run the code and get the same result? For example are you loading the sf library first?

Also, could you show the output that you get so I can make sure that I can reproduce the issue?

[asmarcheva]

Yes, sorry I have never submitted an issue before :)

if (!require("pacman")) install.packages("pacman")
pacman::p_load(PurpleAir, sf) 

get_sensors_data(st_bbox(
  c("xmin" = -76.52, "ymin" = 42.41,
    "xmax" = -76.47, "ymax" = 42.46),
  crs = 4326) , fields = c("name"), location_type = "outside") 

get_sensors_data(st_bbox(c("xmin" = -84.82030, "ymin" = 39.02153,
                           "xmax" = -84.25633, "ymax" = 39.31206),
                         crs = 4326), 
                 fields = c("name"), location_type = "outside")

Output (for both):

# A tibble: 36 × 2
   sensor_index name              
          <int> <chr>             
 1        30561 lineblock_outside2
 2        35107 807D3A615CCF      
 3        35109 807D3A615D8E      
 4        35121 807D3A615C42      
 5        35137 807D3A615C77      
 6        36325 807d3a616167      
 7        36681 68c63a8e59a       
 8        42623 KMI_041           
 9        49213 807D3A615D1E      
10        56287 PSPS_12           
# ℹ 26 more rows
# ℹ Use `print(n = ...)` to see more rows

[cole-brokamp]

Thanks, that is indeed unexpected behavior. I tried to recreate the call using the PurpleAir API documentation tool, I can make a request using these parameters and my API key:

with this response

200 success
{
  "api_version" : "V1.0.14-0.0.58",
  "time_stamp" : 1727908305,
  "data_time_stamp" : 1727908252,
  "max_age" : 604800,
  "firmware_default_version" : "7.02",
  "fields" : ["sensor_index","name"],
  "data" : [
    [30303,"\uC544\uAC00\uD398_\uC2E4\uB0B4"],
    [30561,"lineblock_outside2"],
    [30571,"amlok_inside"],
    [35107,"807D3A615CCF"],
    [35109,"807D3A615D8E"],
    [35121,"807D3A615C42"],
    [35137,"807D3A615C77"],
    [36325,"807d3a616167"],
    [36681,"68c63a8e59a"],
    [42623,"KMI_041"],
    [49213,"807D3A615D1E"],
    [56287,"PSPS_12"],
    [65359,"Ben Lomond"],
    [73997,"Home"],
    [75973,"Living Room"],
    [76099,"Los ninos"],
    [88787,"INDOOR: Fairmount Hill"],
    [98265,"PSPS_8"],
    [108194,"FCF"],
    [111149,"007"],
    [111504,"1810 6th street Berkeley"],
    [111642,"Jay Road"],
    [112992,"10:52:1C:44:17:A1"],
    [119867,"Island of Misfit Toys"],
    [121211,"Westwood hill"],
    [121917,"City of Livermore"],
    [129909,"Wiley Ct"],
    [130921,"Inside Casa"],
    [162115,"Chardonnay Ct"],
    [180103,"Queens College"],
    [208443,"A06"],
    [208445,"015"],
    [208451,"008"],
    [208449,"010"],
    [208453,"004"],
    [208457,"003"],
    [234933,"Central District"],
    [235417,"4418 elser"],
    [243323,"016"],
    [243321,"013"],
    [243327,"A04"],
    [243325,"A01"],
    [243331,"A15"],
    [243329,"A11"]
  ]
}

Running the same example in the R package gives the same results:

# A tibble: 44 × 2
   sensor_index name                    
          <int> <chr>                   
 1        30303 아가페_실내             
 2        30561 lineblock_outside2      
 3        30571 amlok_inside            
 4        35107 807D3A615CCF            
 5        35109 807D3A615D8E            
 6        35121 807D3A615C42            
 7        35137 807D3A615C77            
 8        36325 807d3a616167            
 9        36681 68c63a8e59a             
10        42623 KMI_041                 
11        49213 807D3A615D1E            
12        56287 PSPS_12                 
13        65359 Ben Lomond              
14        73997 Home                    
15        75973 Living Room             
16        76099 Los ninos               
17        88787 INDOOR: Fairmount Hill  
18        98265 PSPS_8                  
19       108194 FCF                     
20       111149 007                     
21       111504 1810 6th street Berkeley
22       111642 Jay Road                
23       112992 10:52:1C:44:17:A1       
24       119867 Island of Misfit Toys   
25       121211 Westwood hill           
26       121917 City of Livermore       
27       129909 Wiley Ct                
28       130921 Inside Casa             
29       162115 Chardonnay Ct           
30       180103 Queens College          
31       208443 A06                     
32       208445 015                     
33       208451 008                     
34       208449 010                     
35       208453 004                     
36       208457 003                     
37       234933 Central District        
38       235417 4418 elser              
39       243323 016                     
40       243321 013                     
41       243327 A04                     
42       243325 A01                     
43       243331 A15                     
44       243329 A11                     

These are not the sensors I expect to see in the bbox and are incorrect, but the R function does return the same answer that the PurpleAir API testing tool does.

So it seems to be an issue with the PurpleAir API. I would suggest opening a thread for support with them. Please let us know what you find out, we would love to make note of it here!

[asmarcheva]

Thanks for checking this; I submitted a post to the PurpleAir forum and I'll let you know what they say