Corona.cast.uark.edu - SEO Checker

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Overview of the SEO Check
Meta information
73% 
Page quality
76% 
Page structure
95% 
Link structure
97% 
Server
95% 
External factors
100% 
SEO Score
Response time
2.14 s
File size
41.90 kB
Words
1939
Media files
15
Number of links
9 internal / 18 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Corona @ CAST UA
The page title is too short. (185 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
A simple georeferencing and orthorectifying system that enables the crowdsourcing of recently declassified Corona imagery datasets. Useful for geographers, archaeologists, and many other social and physical scientists.
The meta description is too long: 1353 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
No favicon is linked in the HTML code.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no
descriptionA simple georeferencing and orthorectifying system that enables the crowdsourcing of recently declassified Corona imagery datasets. Useful for geographers, archaeologists, and many other social and physical scientists.
authorsJohn Wilson; Christopher Angel; @UA_CAST
langen
charsetutf-8

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Page quality

Content
(Critically important)
This page contains 1939 words. That's ok.
38.2% of the text are stop words.
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
24 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 18.38 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" is provided.
Bold and strong tags
(Somewhat important)
Some tags are too long. With 106 characters this one is longer than 70 characters:
"please make sure to include an image identifier (i.e. "1111-2167a023") to help us find the right image..."
Image SEO
(Somewhat important)
14 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
/assets/images/home/corona_background.jpgHome
...o/logo-text-horizontal-light-320x104.pngNo alt attribute provided
...org/presskit/icons/cc.svg?ref=chooser-v1No alt attribute provided
...org/presskit/icons/by.svg?ref=chooser-v1No alt attribute provided
...org/presskit/icons/sa.svg?ref=chooser-v1No alt attribute provided
...ets/images/home/button_distance_blue.pngNo alt attribute provided
/assets/images/home/button_area_blue.pngNo alt attribute provided
.../images/home/button_coordinates_blue.pngNo alt attribute provided
/assets/images/home/ForeAftoverlap.pngNo alt attribute provided
/assets/images/home/imageoverlap_red.pngNo alt attribute provided
...s/images/home/revolutionoverlap_blue.pngNo alt attribute provided
...o/logo-text-horizontal-light-320x104.pngNo alt attribute provided
/assets/images/home/acls_logo.pngNo alt attribute provided
/assets/images/home/nsf1.gifNo alt attribute provided
/assets/images/home/neh_logo.pngNo alt attribute provided

Page structure

H1 heading
(Critically important)
Corona Atlas & Referencing System
The H1 heading is perfect.
Headings
(Important)
Some headings occur twice on the page.

Heading structure

Heading levelContent
H1 Corona Atlas & Referencing System
H2 About the Project
H2 Atlas Basics
H2 Check out the 2016 Corona Workshop
H2 Atlas Layers
H2 Credits
H2 Atlas Tools
H2 Corona Imagery
H3 Navigation
H3 Visibility
H3 Contents
H4 Missions
H4 Corona Imagery Duplicate text
H4 Sites
H4 Transparency Sliders
H4 Swipe Slider
H4 Measurements
H4 Report an image alignment problem
There are too few (9) internal links on this page.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 18 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://corona.cast.uark.edu/Anchor Corona @ CAST
https://corona.cast.uark.edu/Anchor HOME
https://corona.cast.uark.edu/Anchor ABOUT
https://corona.cast.uark.edu/Anchor BASICS
https://corona.cast.uark.edu/Anchor LAYERS
https://corona.cast.uark.edu/Anchor TOOLS
https://corona.cast.uark.edu/Anchor IMAGERY
/atlasSubdomain Explore Atlas
http://eros.usgs.gov/New window External Subdomain Anchor US Geological Survey
http://www.neh.gov/New window External Subdomain National Endowment for the Humanities
http://www.acls.org/New window External Subdomain American Council of Learned Societies
http://www.uark.edu/New window External Subdomain University of Arkansas
https://cast.uark.edu/New window External Subdomain CAST
http://eros.usgs.gov/New window External Subdomain Anchor Trivial anchor text
here
http://oi.uchicago.edu/researc...New window External Subdomain CAMEL
http://oi.uchicago.edu/New window External Subdomain Oriental Institute
https://corona.cast.uark.edu/Subdomain Corona Atlas & Referencing System
https://cast.uark.edu/External Subdomain Center for Advanced Spatial Technologies, University of Arkansas
https://creativecommons.org/li...New window External CC BY-SA 4.0
https://coronaworkshop2016.wor...External Subdomain Workshop
http://srtm.csi.cgiar.org/New window External Subdomain URL anchor text
http://srtm.csi.cgiar.org
https://cast-ftp1.cast.uark.ed...New window External Subdomain Trivial anchor text
HERE
http://gmv.cast.uark.edu/2930/...New window External Subdomain Text duplicate Trivial anchor text
HERE
http://www.cast.uark.edu/External Subdomain No Text
http://www.acls.org/External Subdomain No Text
https://www.nsf.gov/External Subdomain No Text
https://www.neh.gov/External Subdomain No Text

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://corona.cast.uark.edu/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is very slow (2.14 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
A Content Delivery Network like Bootstrap CDN can save bandwidth for Bootstrap front-end component library.
The file size of the HTML document is fine (42 kB).

HTTP Response Header

NameValue
servernginx
dateMon, 11 Aug 2025 00:06:46 GMT
content-typetext/html; charset=UTF-8
content-length10622
expiresThu, 19 Nov 1981 08:52:00 GMT
cache-controlno-store, no-cache, must-revalidate
pragmano-cache
set-cookie145 Characters
varyAccept-Encoding
content-encodinggzip
statuscode200
http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 102 referring domains.
This page has 758 backlinks.
This page has backlinks from 81 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

User-agent: *
Disallow: /atlas

Similar sites

Search preview

corona.cast.uark.edu
Corona @ CAST UA
A simple georeferencing and orthorectifying system that enables the crowdsourcing of recently declassified Corona imagery datasets. Useful for geographers, archaeologists, and many other social and physical scientists.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Corona95%Check
Corona CAST79%Check
CORONA imagery77%Check
CORONA images70%Check
Corona CAST UA69%Check
CORONA missions68%Check
CORONA satellite66%Check
Corona Imagery layer65%Check
System62%Check
image61%Check
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