Blackmarble.gsfc.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
72% 
Page quality
81% 
Page structure
70% 
Link structure
75% 
Server
1% 
External factors
100% 
SEO Score
Response time
0.76 s
File size
43.30 kB
Words
1339
Media files
22
Number of links
15 internal / 67 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
NASA's Black Marble
The page title is too short. (193 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
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
Server location: United States of America
The language is not specified in the HTML markup.
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 (ISO-8859-1) 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)
The favicon is linked correctly.

Meta tags

No meta tags were found.

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Page quality

Content
(Critically important)
The average number of words per sentence of 6.12 words is low.
This page contains 1339 words. That's ok.
16.7% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
15 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.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
This page loads 9 JavaScript files. This may affect the load time negatively.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 27 tags for this page.
Image SEO
(Somewhat important)
1 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
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
/images/NASA_logo.svg.pngNasa logo
/images/Content/black_marble_processing.gifBlack Marble Science
/images/europe_vir_2016.jpgGlobal City Lights
/images/middleast_vir_2016_conf.jpgNight Lights Change in the Middle East
/images/iceland_vir_2016_ea.jpgIceland at Night
/images/southamerica_vir_2016_tn.jpgAn odd Symmetry: Argentina After Dark
/images/midwest_vir_2016_detail_le_uc.pngObserving Changes in Nighttime Lights in Chicago
/images/indus_vir_2016_ue.jpgThe flow of the Indus River Basin 2016
/images/Content/VIIRS.jpgVIIRS Instrument
/images/Content/VNP46A1_Img_noScale.pngThe VNP46A1 Daily At-sensor TOA Nighttime Radiance Product
/images/Content/VNP46A2_Img_noScale.pngThe VNP46A2 Daily Moonlight-adjusted Nighttime Lights (NTL) Product
/images/Content/VNP46A1_2_Scale1.pngNo alt attribute provided
/images/NASA_logo.svg.pngNasa logo
/images/nasa-goddard-logo.pngGSFC logo
Video URLWidthHeight
https://www.youtube.com/embed/8dc58ZrOuck600420
https://www.youtube.com/embed/XJZAEAep2hc
https://www.youtube.com/embed/s_XE-m7FN74
https://www.youtube.com/embed/gBVJv0Pa-s8
/images/Presentations/Vid/playlist.mp4100%
...s/Presentations/Vid/ScienceInSeconds.mp4100%
...g culture from space PressConference.mp4100%

Page structure

H1 heading
(Critically important)
NASA's Black Marble Nasa logo
Too many H1 headings
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 NASA's Black Marble Nasa logo
H1 IN THE NEWS
H2 Advancing the Science of Earth at Night
H2 Hurricane Helene - Drak Nights in Georgia
H2 Change in Night Lights between 2012 and 2023
H2 Derecho Darkens Houston
H2 Royal Statistical Society Award
H2 Tracking Nightlights in Libya
H2 Power Supply Recovery Assessment following the Marash/Antep Earthquake
H2 Tracking Night Lights in Ukraine
The number of internal links is ok.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are too many external links (67) on this page.

Found links on this page

LinkAttributesAnchor text
https://earthobservatory.nasa....External Subdomain Hurricane Helene - Drak Nights in Georgia
https://svs.gsfc.nasa.gov/5276/External Subdomain Change in Night Lights between 2012 and 2023
https://earthobservatory.nasa....External Subdomain Derecho Darkens Houston
https://rss.org.uk/news-public...External Royal Statistical Society Award
https://earthobservatory.nasa....External Subdomain Tracking Nightlights in Libya
https://unosat.org/products/3565External Power Supply Recovery Assessment following the Marash/Antep Earthquake
https://earthobservatory.nasa....External Subdomain Tracking Night Lights in Ukraine
/Anchor Home
/Anchor About
https://viirsland.gsfc.nasa.go...New window External Subdomain Product User Guide V2.0 (Collection 2)
https://viirsland.gsfc.nasa.go...New window External Subdomain Product User Guide V1.2 (Collection 1)
https://viirsland.gsfc.nasa.go...New window External Subdomain Product ATBD
/Anchor Data Creation
/Anchor Applications
/Anchor Instrument
/Anchor Products
/Anchor Media
/Anchor People
https://worldview.earthdata.na...New window External Subdomain World View Portal
/Tools.htmlNew window Tools
https://svs.gsfc.nasa.gov/5276/New window External Subdomain Text duplicate Change in Night Lights between 2012 and 2023
/VNP46A1.htmlNew window Product Release - VNP46A1 Daily At-sensor TOA Nighttime Radiance Product
/VNP46A2.htmlNew window Product Release: VNP46A2 - Daily Lunar BRDF Adjusted Nighttime Lights
https://ladsweb.modaps.eosdis....New window External Subdomain Product Release - VNP46A3 - VIIRS/NPP Lunar BRDF-Adjusted Nighttime Lights Monthly Product
https://ladsweb.modaps.eosdis....New window External Subdomain Product Release - VNP46A4 - VIIRS/NPP Lunar BRDF-Adjusted Nighttime Lights Yearly Product
https://www.sciencedirect.com/...External Subdomain Trivial anchor text
here
https://earthobservatory.nasa....External Subdomain IMG-ALT Global City Lights
https://earthobservatory.nasa....External Subdomain Text duplicate Global City Lights
https://earthobservatory.nasa....External Subdomain IMG-ALT Night Lights Change in the Middle East
https://earthobservatory.nasa....External Subdomain Text duplicate Night Lights Change in the Middle East
https://earthobservatory.nasa....External Subdomain IMG-ALT Iceland at Night
https://earthobservatory.nasa....External Subdomain Text duplicate Iceland at Night
https://earthobservatory.nasa....External Subdomain IMG-ALT An odd Symmetry: Argentina After Dark
https://earthobservatory.nasa....External Subdomain Text duplicate An odd Symmetry: Argentina After Dark
https://earthobservatory.nasa....External Subdomain IMG-ALT Observing Changes in Nighttime Lights in Chicago
https://earthobservatory.nasa....External Subdomain Observing Changes in Nighttime Lights, Chicago
https://earthobservatory.nasa....External Subdomain IMG-ALT The flow of the Indus River Basin 2016
https://earthobservatory.nasa....External Subdomain The flow of the Indus River Basin
https://ladsweb.modaps.eosdis....External Subdomain here.
https://ladsweb.modaps.eosdis....External Subdomain NASA LAADS Archive
https://developers.google.com/...External Subdomain Google EarthEngine
https://ladsweb.modaps.eosdis....External Subdomain Text duplicate NASA LAADS Archive
https://developers.google.com/...External Subdomain Text duplicate Google EarthEngine
https://ladsweb.modaps.eosdis....External Subdomain Text duplicate NASA LAADS Archive
https://ladsweb.modaps.eosdis....External Subdomain Text duplicate NASA LAADS Archive
https://search.earthdata.nasa....External Subdomain Daily
https://search.earthdata.nasa....External Subdomain Hourly
/tools/BlackMarbleTiles.zipNew window Download Black Marble Tile Grid Shapefile
/VNP46A1.htmlIMG-ALT The VNP46A1 Daily At-sensor TOA Nighttime Radiance Product
/VNP46A2.htmlIMG-ALT The VNP46A2 Daily Moonlight-adjusted Nighttime Lights (NTL) Product
https://earthobservatory.nasa....New window External Subdomain "Dark Nights in Georgia" NASA Earth Observatory. October , 2024
https://earthobservatory.nasa....New window External Subdomain "Derecho Darkens Houston" NASA Earth Observatory. May 23, 2024
https://earthobservatory.nasa....New window External Subdomain "Tracking Nightlights in Libya" NASA Earth Observatory. September 25, 2023
https://www.unosat.org/product...New window External Subdomain "Night-Time Light Loss Assessment in Derna and Al Bayda (Libya) using Night-time Light Imagery" UNOSAT. September 20, 2023
https://unosat.org/products/3565New window External "Power Supply Recovery Assessment following the Marash / Antep Earthquake using Night-time Light Imagery" UNOSAT. April 20, 2023
https://www.unosat.org/product...New window External Subdomain "Preliminary Night-time Light Loss Assessment Following the Adassil/Al Haouz Earthquake in Marrakech-Safi Region" UNOSAT. September 12, 2023
https://www.unosat.org/product...New window External Subdomain "Power Supply Assessment in Tigray, Ethiopia using Night-time Light Imagery, Tigray Region, Ethiopia" UNOSAT. September 06, 2023
https://www.nytimes.com/2023/0...New window External Subdomain "Ukraine Goes Dark: Images From Space Drive Home the Nation's Anguish" New York Times. March 30, 2023
https://news.sky.com/story/ukr...New window External Subdomain "LIghts over Ukraine: The Energy War" Sky News. December 23, 2022
/Media.htmlNew window More..
https://doi.org/10.1371/journa...New window External doi:10.1371/journal.pone.0218883
https://doi.org/10.1109/LGRS.2...New window External doi:10.1109/LGRS.2022.3176616
http://doi.org/10.1016/j.rse.2...New window External 10.1016/j.rse.2021.112557
http://doi.org/10.5194/isprs-a...New window External doi:10.5194/isprs-archives-xlii-3-1853-2018
http://doi.org/10.1016/j.rse.2...New window External doi:10.1016/j.rse.2018.03.017
https://doi.org/10.1147/JRD.20...New window External doi:10.1147/JRD.2019.2954404
https://doi.org/10.1016/j.rse....New window External doi:10.1016/j.rse.2019.111443
http://doi.org/10.3390/rs9030286New window External doi:10.3390/rs9030286
http://doi.org/10.1002/2014ef0...New window External doi:10.1002/2014ef000285
https://science.gsfc.nasa.gov/...New window External Subdomain Zhuosen Wang, UMD/NASA GSFC
https://www.usra.edu/efsi-teamNew window External Subdomain Eleanor Stokes, USRA/EfSI
https://science.gsfc.nasa.gov/...New window External Subdomain Virginia Kalb, NASA GSFC
https://science.gsfc.nasa.gov/...New window External Subdomain Miguel Román, Leidos
https://science.gsfc.nasa.gov/...New window External Subdomain Ranjay Shrestha, SSAI/NASA GSFC
https://science.gsfc.nasa.gov/...New window External Subdomain Srija Chakraborty, USRA/NASA GSFC
https://gerslab.uconn.edu/pers...New window External Subdomain Zhe Zhu, UCONN
https://science.gsfc.nasa.gov/...New window External Subdomain Tian Yao, SSAI/NASA GSFC
https://www.usra.edu/efsi-teamNew window External Subdomain Tomohiro (Tom) Oda, USRA
https://environment.yale.edu/p...New window External Subdomain Karen C. Seto, Yale University
http://www.nasa.gov/New window External Subdomain IMG-ALT Nasa logo
http://www.nasa.gov/goddard/New window External Subdomain IMG-ALT GSFC logo
http://www.nasa.gov/about/high...New window External Subdomain Privacy Policy & Important Notices

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://blackmarble.gsfc.nasa.gov/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.76 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
This page loads 9 CSS files. This may affect the page load time negatively.
This page loads 9 JavaScript files. This may affect the load time negatively.
The file size of the HTML document is fine (43 kB).

HTTP Response Header

NameValue
dateSun, 20 Oct 2024 13:30:07 GMT
serverWebServer/1.0 mod_perl/2.0.8 Perl/v5.10.1
content-security-policyupgrade-insecure-requests;
x-frame-optionsSAMEORIGIN
accept-rangesbytes
content-length44369
connectionclose
content-typetext/html; charset=ISO-8859-1
strict-transport-securitymax-age=31536000; includeSubDomains
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 244 referring domains.
This page has 698 backlinks.
This page has backlinks from 205 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

No valid Robots.txt file was found.

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blackmarble.gsfc.nasa.gov
NASA's Black Marble

Most important keywords

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

KeywordResultRecheck
Black77%Check
NASA77%Check
Marble77%Check
Black Marble77%Check
NASA Black Marble Nighttime67%Check
NASA GSFC62%Check
NASA's Black Marble60%Check
GSFC48%Check
Lights44%Check
Earth43%Check
Show more keywords and terms

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