我学习使用传单创建其他图层。我成功创建了一个名为“国家公园网站”的图层。但是，当我创建另一个图层时。如下所示有错误。 我的代码是：
popup_NationalPark<-paste0("<strong>Use Name:</strong>",
NationalPark$name,
"<br><strong>National Park Area (Arces): </strong>",
NationalPark$`area measured with acres`)
popup_NationalMonument<-paste0("<strong>Use Name:</strong>",
NationalMonument$name,
"<br><strong>National MonumentDate Established: </strong>",
NationalMonument$`date established`)
pal <- colorQuantile("YlOrRd", NULL, n = 9)
gmap <- leaflet(data = cancermap) %>%
# Base groups
addTiles() %>%
setView(lng = -105, lat = 40, zoom = 4) %>%
addPolygons(fillColor = ~pal(rate),
fillOpacity = 0.8,
color = "#BDBDC3",
weight = 1,
popup = popup_dat,
group="Cancer Rate/100,000 by Counties") %>%
# Overlay groups
addMarkers(data=LandUse,lat=~lat, lng=~lng, popup=popup_LU,
group = "Land Use Sites") %>%
addCircleMarkers(data=NationalPark,
lat=~lat, lng=~lng,
color = "green",
popup = popup_NationalPark,
group="National Park Sites")%>%
addCircleMarkers(data=NationalMonument,
lat=~lat,lng=~lng,
color="red",
popup= popup_NationalMonument,
group="National Monument Sites")%>%
# Layers control
addLayersControl(
baseGroups = c("Cancer Rate/100,000 by Counties"),
overlayGroups = c("Land Use Sites","National Park Sites","National
Monument Sites"),
options = layersControlOptions(collapsed = FALSE)
)
gmap
结果是：
Error in gsub("</", "\\u003c/", payload, fixed = TRUE) :
invalid multibyte string at '<99> <48>ome<br><strong>National MonumentDate
Established: </strong>7-Jul-00","<strong>Use Name:</strong>Pullman<br>
<strong>National MonumentDate Established: </strong>19-Feb-15","<strong>Use
Name:</strong>Rainbow Bridge<br><strong>National MonumentDate Established:
</strong>30-May-10","<strong>Use Name:</strong>R铆o Grande del Norte<br>
<strong>National MonumentDate Established: </strong>25-Mar-13","<strong>Use
Name:</strong>Rose Atoll Marine<br><strong>National MonumentDate
Established: </strong>6-Jan-09","<strong>Use Name:</strong>Russell Cave<br>
<strong>National MonumentDate Established: </strong>11-May-61","<strong>Use
Name:</strong>Salinas Pueblo Missions<br><strong>National MonumentDate
Established: </strong>1-Nov-09","<strong>Use Name:</strong>San Gabriel
Mountains<br><strong>National MonumentDate Established: </strong>10-Oct-
14","<strong>Use Name:</strong>San Juan Islands<br><strong>National
MonumentDate Established: </strong>25-Mar-13","<
我的数据如下：
> NationalMonument$name
[1] "Admiralty Island" "African Burial Ground"
[3] "Agate Fossil Beds" "Agua Fria"
[5] "Alibates Flint Quarries" "Aniakchak"
[7] "Aztec Ruins" "Bandelier"
[9] "Basin and Range" "Bears Ears"
[11] "Belmont-Paul Women's Equality" "Berryessa Snow Mountain"
[13] "Booker T. Washington" "Browns Canyon"
[15] "Buck Island Reef" "Cabrillo"
[17] "California Coastal" "Canyon de Chelly"
[19] "Canyons of the Ancients" "Cape Krusenstern"
[21] "Capulin Volcano" "Carrizo Plain"
[23] "Casa Grande Ruins" "Cascade–Siskiyou"
[25] "Castillo de San Marcos" "Castle Clinton"
[27] "Castle Mountains" "Cedar Breaks"
[29] "César E. Chávez" "Charles Young Buffalo Soldiers"
[31] "Chimney Rock" "Chiricahua"
[33] "Colorado" "Craters of the Moon"
[35] "Devils Postpile" "Devils Tower"
[37] "Dinosaur" "Effigy Mounds"
[39] "El Malpais" "El Morro"
[41] "Florissant Fossil Beds" "Fort Frederica"
[43] "Fort Matanzas" "Fort McHenry"
[45] "Fort Monroe" "Fort Ord"
[47] "Fort Pulaski" "Fort Stanwix"
[49] "Fort Sumter" "Fort Union"
[51] "Fossil Butte" "George Washington Birthplace"
[53] "George Washington Carver" "Giant Sequoia"
[55] "Gila Cliff Dwellings" "Gold Butte"
[57] "Governors Island" "Grand Canyon-Parashant"
[59] "Grand Portage" "Grand Staircase-Escalante"
[61] "Hagerman Fossil Beds" "Hanford Reach"
[63] "Hohokam Pima" "Homestead"
[65] "Honouliuli" "Hovenweep"
[67] "Ironwood Forest" "Jewel Cave"
[69] "John Day Fossil Beds" "Kasha-Katuwe Tent Rocks"
[71] "Katahdin Woods and Waters" "Lava Beds"
[73] "Little Bighorn Battlefield" "Marianas Trench Marine"
[75] "Military Working Dog Teams" "Misty Fjords"
[77] "Mojave Trails" "Montezuma Castle"
[79] "Mount St. Helens" "Muir Woods"
[81] "Natural Bridges" "Navajo"
[83] "Newberry" "Northeast Canyons and
Seamounts Marine"
[85] "Ocmulgee" "Oregon Caves"
[87] "Organ Pipe Cactus" "Organ Mountains-Desert Peaks"
[89] "Pacific Remote Islands Marine" "Papahānaumokuākea Marine"
[91] "Petroglyph" "Pipe Spring"
[93] "Pipestone" "Pompeys Pillar"
[95] "Poverty Point" "Prehistoric Trackways"
[97] "President Lincoln and Soldiers’ Home" "Pullman"
[99] "Rainbow Bridge" "Río Grande del Norte"
[101] "Rose Atoll Marine" "Russell Cave"
[103] "Salinas Pueblo Missions" "San Gabriel Mountains"
[105] "San Juan Islands" "Sand to Snow"
[107] "Santa Rosa and San Jacinto Mountains" "Scotts Bluff"
[109] "Sonoran Desert" "Statue of Liberty"
[111] "Stonewall" "Sunset Crater Volcano"
[113] "Timpanogos Cave" "Tonto"
[115] "Tule Springs Fossil Beds" "Tuzigoot"
[117] "Upper Missouri River Breaks" "Vermilion Cliffs"
[119] "Virgin Islands Coral Reef" "Waco Mammoth"
[121] "Walnut Canyon" "White Sands"
[123] "World War II Valor in the Pacific" "Wupatki"
[125] "Yucca House"
> NationalMonument$`date established`
[1] "1-Dec-78" "27-Feb-06" "14-Jun-97" "11-Jan-00" "21-Aug-65" "1-Dec-78"
"24-Jan-23"
[8] "11-Feb-16" "10-Jul-15" "28-Dec-16" "12-Apr-16" "10-Jul-15" "2-Apr-56"
"19-Feb-15"
[15] "28-Dec-61" "14-Oct-13" "11-Jan-00" "1-Apr-31" "9-Jun-00" "1-Dec-78"
"9-Aug-16"
[22] "12-Jan-01" "3-Aug-18" "9-Jun-00" "15-Oct-24" "12-Aug-46" "12-Feb-
16" "22-Aug-33"
[29] "8-Oct-12" "25-Mar-13" "21-Sep-12" "18-Apr-24" "24-May-11" "2-May-24"
"6-Jul-11"
[36] "24-Sep-06" "4-Oct-15" "25-Oct-49" "31-Dec-87" "8-Dec-06" "20-Aug-
69" "26-May-36"
[43] "15-Oct-24" "3-Mar-25" "1-Nov-11" "20-Apr-12" "15-Oct-24" "21-Aug-
35" "28-Apr-48"
[50] "5-Apr-56" "23-Oct-72" "23-Jan-30" "14-Jul-43" "15-Apr-00" "16-Nov-
07" "28-Dec-16"
[57] "19-Jan-01" "11-Jan-00" "27-Jan-60" "18-Sep-96" "18-Nov-88" "8-Jun-00"
"21-Oct-72"
[64] "19-Mar-36" "19-Feb-15" "2-Mar-23" "9-Jun-00" "7-Feb-08" "26-Oct-
74" "17-Jan-01"
[71] "24-Aug-16" "21-Nov-25" "1-Jul-40" "6-Jan-09" "28-Oct-13" "1-Dec-78"
"12-Feb-16"
[78] "8-Dec-06" "27-Aug-82" "9-Jan-08" "16-Apr-08" "20-Mar-09" "5-Nov-90"
"15-Sep-16"
[85] "23-Dec-36" "12-Jul-09" "13-Apr-37" "21-May-14" "6-Jan-09" "15-Jun-
06" "27-Jun-90"
[92] "31-May-23" "25-Aug-37" "17-Jan-01" "31-Oct-88" "30-Mar-09" "7-Jul-00"
"19-Feb-15"
[99] "30-May-10" "25-Mar-13" "6-Jan-09" "11-May-61" "1-Nov-09" "10-Oct-
14" "25-Mar-13"
[106] "12-Feb-16" "24-Oct-00" "12-Dec-19" "17-Jan-01" "15-Oct-24" "24-Jun-
16" "30-May-30"
[113] "14-Oct-22" "21-Oct-07" "19-Dec-14" "25-Jul-39" "17-Jan-01" "9-Nov-00"
"17-Jan-01"
[120] "10-Jul-15" "30-Nov-15" "18-Jan-33" "5-Dec-08" "9-Dec-24" "19-Dec-
19"