Presentation

class: theme-xaringan-title-slide, center, middle

# Connecting R and QGIS

### Dewey Dunnington

### Fisheries and Oceans Canada

<br/>

<https://dewey.dunnington.ca/slides/qgisprocess2021>

.landscape[

]

---
class: center, middle

![qgis_proces tweet](qgis-process-tweet.png)

---

# Using qgisprocess

The magic is all from the [`qgis_process` command-line utility](https://docs.qgis.org/3.16/en/docs/user_manual/processing/standalone.html#using-processing-from-the-command-line)! (QGIS >= 3.16)

<br/>

$ qgis_process
    QGIS Processing Executor - 3.16.10-Hannover 'Hannover' (3.16.10-Hannover)
    Usage: qgis_process [--json] [command] [algorithm id or path to model file] [parameters]

---

# Using qgisprocess

```r
# remotes::install_github("paleolimbot/qgisprocess")
library(qgisprocess)
```

```
## Using 'qgis_process' at '/Applications/QGIS-LTR.app/Contents/MacOS/bin/qgis_process'.
## QGIS version: 3.16.10-Hannover
## Metadata of 971 algorithms successfully cached.
## Run `qgis_configure()` for details.
```

---

# Using qgisprocess

```r
library(sf)

nc <- read_sf(system.file("gpkg/nc.gpkg", package = "sf")) %>% 
  st_transform("EPSG:3358") # North Carolina state plane

result <- qgis_run_algorithm(
  "native:buffer",
  INPUT = nc,
  DISTANCE = 100000,
  DISSOLVE = TRUE
)
```

---

# Using qgisprocess

Running qgis_process run 'native:buffer' \
      '--INPUT=/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpOKFcD5/file607b669acaa1/file607b1aa5ed2f.gpkg' \
      '--DISTANCE=1' '--END_CAP_STYLE=0' '--JOIN_STYLE=0' '--DISSOLVE=TRUE' \
      '--OUTPUT=/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpOKFcD5/file607b669acaa1/file607b376b654.gpkg

---

# Using qgisprocess
      
    ----------------
    Inputs
    ----------------
    
    DISSOLVE:	TRUE
    DISTANCE:	1
    END_CAP_STYLE:	0
    INPUT:	/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpOKFcD5/file607b669acaa1/file607b1aa5ed2f.gpkg
    JOIN_STYLE:	0
    OUTPUT:	/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpOKFcD5/file607b669acaa1/file607b376b654.gpkg
    
    
    0...10...20...30...40...50...60...70...80...90...

---

# Using qgisprocess
    
    ----------------
    Results
    ----------------
    
    OUTPUT:	/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpOKFcD5/file607b669acaa1/file607b376b654.gpkg

---

# Using qgisprocess

```r
result
```

```
## <Result of `qgis_run_algorithm("native:buffer", ...)`>
## List of 1
##  $ OUTPUT: 'qgis_outputVector' chr "/var/folders/gt/l87wjg8s7312zs9s7c1fgs900000gn/T//RtmpgDeO62/file7f83185152d9/file7f83802d734.gpkg"
```

---

# Using qgisprocess

```r
library(sf)

output_sf <- st_as_sf(result)
plot(st_geometry(output_sf))
```

![](presentation_files/figure-html/unnamed-chunk-4-1.png)

---

# Using qgisprocess

```r
qgis_algorithms()
```

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  </script>
</div>

---

# Using qgisprocess

```r
qgis_show_help("native:buffer")
```

Buffer (native:buffer)
    
    ----------------
    Description
    ----------------
    This algorithm computes a buffer area for all the features 
    in an input layer, using a fixed or dynamic distance.
    ...
    ----------------
    Arguments
    ----------------
    ...
    ----------------
    Outputs
    ----------------
    ...

---

# Challenges

```r
qgis_run_algorithm(
  "native:aggregate",
  INPUT = nc,
  AGGREGATES = "???"
)
```

ERROR:	An error was encountered while checking parameter values
    	Incorrect parameter value for AGGREGATES

---

# Challenges

```r
system.time(qgis_run("list"))
```

```
##    user  system elapsed 
##   1.421   0.855   3.199
```

---

# Opportunities

```r
# remotes::install_github("JanCaha/r_package_qgis")
library(qgis)
result <- qgis_buffer(nc, 100000)
```

```r
result
```

---

# Opportunities

```r
?qgis_buffer
```

![qgis_buffer help in qgis package](qgis-buffer-help.png)

---

# Acknowledgements

- QGIS authors: Nyall Dawson

- qgisprocess collaborators: Jan Caha, Robin Lovelace, Jannes Muenchow, Lorena Abad Crespo, Floris Vanderhaeghe, Antony Barja, Gabo Gaona

- Fisheries and Oceans Canada: Clark Richards, Blair Greenan

---

# Questions?

qgisprocess on GitHub: <https://github.com/paleolimbot/qgisprocess>

@paleolimbot on Twitter

@paleolimbot on GitHub

These slides: <https://dewey.dunnington.ca/slides/qgisprocess2021>

.landscape[

]